Gandalf possesed Power of the mind and ability to influence people and great wisdom.

Gandalf is the wisest of the Maiar. He was known as Olórin, who sometimes dwelt in the gardens of Irmo and was the pupil of Nienna, who taught him wisdom and pity, and of Manwë and Varda. When the Valar decided to send the order of the Wizards (also known as the Istari) to Middle-earth, Olórin was proposed by Manwë and Varda, in order to counsel and assist all those in Middle-earth who opposed the Dark Lord Sauron. Upon entrance in Middle-earth, Gandalf (Olorin) spent a good thousand or two years walking among the elves as a stranger and learning from them and teaching them. He later revealed himself as Istari, and has come to be known as the wisest of that order. He is the wisest and most powerful of the Five Wizards: although some have conjectured that Saruman was more powerful due to his pre-War position as head of the Wise, Tolkien wrote that Saruman knew Gandalf possessed the greater power and wisdom and hated him for it.(Appendix B: The Tale of Years, The Third Age, Year 2953).

Grey or White what has he done?

I think you're missing the point of Gandalf and appear to be looking for some kind of military prowess where he defeats his enemies through sheer magic. That's not Gandalf, Gandalf succeeds through wisdom.

• Who researched and figured out the ring Bilbo had was indeed the One Ring? Gandalf.
• Who identified the Necromancer in Mirkwood as Sauron and informed the White Council? Gandalf.
• Who organised the fellowship into destroying the One Ring? Gandalf.
• Who sacrificed himself, even though he was immortal when the Fellowship came under threat of the Balrog? Gandalf.
• Who returned Theoden to his throne and threw out Saruman? Gandalf
• Who came to the rescue at Helms Deep? Gandalf
• Who orchestrated the destruction of Isengard and threw down Saruman? Gandalf.
• Who organised the defence of Gondor in the absence of the Steward? Gandalf.

I could go on but I think you get the point thart Gandalf through his wisdom of knowing what to do was absolutely key in insuring the One Ring was destroyed and Sauron ultimately defeated. Even if it was done without any magic, sorcery or military prowess.

Gandalf possessed Power of the mind and ability to influence people and great wisdom.

Gandalf is the wisest of the Maiar. He was known as Olórin, who sometimes dwelt in the gardens of Irmo and was the pupil of Nienna, who taught him wisdom and pity, and of Manwë and Varda. When the Valar decided to send the order of the Wizards (also known as the Istari) to Middle-earth, Olórin was proposed by Manwë and Varda, in order to counsel and assist all those in Middle-earth who opposed the Dark Lord Sauron. Upon entrance in Middle-earth, Gandalf (Olórin) spent a good thousand or two years walking among the elves as a stranger and learning from them and teaching them. He later revealed himself as Istari, and has come to be known as the wisest of that order. He is the wisest and most powerful of the Five Wizards: although some have conjectured that Saruman was more powerful due to his pre-War position as head of the Wise, Tolkien wrote that Saruman knew Gandalf possessed the greater power and wisdom and hated him for it. 

(Appendix B: The Tale of Years, The Third Age, Year 2953).

Grey or White what has he done?

I think you're missing the point of Gandalf and appear to be looking for some kind of military prowess where he defeats his enemies through sheer magic. That's not Gandalf, Gandalf succeeds through wisdom.

• Who researched and figured out the ring Bilbo had was indeed the One Ring? Gandalf.
• Who identified the Necromancer in Mirkwood as Sauron and informed the White Council? Gandalf.
• Who organised the fellowship into destroying the One Ring? Gandalf.
• Who sacrificed himself, even though he was immortal when the Fellowship came under threat of the Balrog? Gandalf.
• Who returned Theoden to his throne and threw out Saruman? Gandalf
• Who came to the rescue at Helms Deep? Gandalf
• Who orchestrated the destruction of Isengard and threw down Saruman? Gandalf.
• Who organised the defense of Gondor in the absence of the Steward? Gandalf.

I could go on but I think you get the point that Gandalf through his wisdom of knowing what to do was absolutely key in insuring the One Ring was destroyed and Sauron ultimately defeated. Even if it was done without any magic, sorcery or military prowess.

Gandalf possesed Power of the mind and ability to influence people and great wisdom.

Gandalf is the wisest of the Maiar. He was known as Olórin, who sometimes dwelt in the gardens of Irmo and was the pupil of Nienna, who taught him wisdom and pity, and of Manwë and Varda. When the Valar decided to send the order of the Wizards (also known as the Istari) to Middle-earth, Olórin was proposed by Manwë and Varda, in order to counsel and assist all those in Middle-earth who opposed the Dark Lord Sauron. Upon entrance in Middle-earth, Gandalf (Olorin) spent a good thousand or two years walking among the elves as a stranger and learning from them and teaching them. He later revealed himself as Istari, and has come to be known as the wisest of that order. He is the wisest and most powerful of the Five Wizards: although some have conjectured that Saruman was more powerful due to his pre-War position as head of the Wise, Tolkien wrote that Saruman knew Gandalf possessed the greater power and wisdom and hated him for it.(Appendix B: The Tale of Years, The Third Age, Year 2953).

Gandalf possesed Power of the mind and ability to influence people and great wisdom.

Gandalf is the wisest of the Maiar. He was known as Olórin, who sometimes dwelt in the gardens of Irmo and was the pupil of Nienna, who taught him wisdom and pity, and of Manwë and Varda. When the Valar decided to send the order of the Wizards (also known as the Istari) to Middle-earth, Olórin was proposed by Manwë and Varda, in order to counsel and assist all those in Middle-earth who opposed the Dark Lord Sauron. Upon entrance in Middle-earth, Gandalf (Olorin) spent a good thousand or two years walking among the elves as a stranger and learning from them and teaching them. He later revealed himself as Istari, and has come to be known as the wisest of that order. He is the wisest and most powerful of the Five Wizards: although some have conjectured that Saruman was more powerful due to his pre-War position as head of the Wise, Tolkien wrote that Saruman knew Gandalf possessed the greater power and wisdom and hated him for it.(Appendix B: The Tale of Years, The Third Age, Year 2953).

Grey or White what has he done?

I think you're missing the point of Gandalf and appear to be looking for some kind of military prowess where he defeats his enemies through sheer magic. That's not Gandalf, Gandalf succeeds through wisdom.

• Who researched and figured out the ring Bilbo had was indeed the One Ring? Gandalf.
• Who identified the Necromancer in Mirkwood as Sauron and informed the White Council? Gandalf.
• Who organised the fellowship into destroying the One Ring? Gandalf.
• Who sacrificed himself, even though he was immortal when the Fellowship came under threat of the Balrog? Gandalf.
• Who returned Theoden to his throne and threw out Saruman? Gandalf
• Who came to the rescue at Helms Deep? Gandalf
• Who orchestrated the destruction of Isengard and threw down Saruman? Gandalf.
• Who organised the defence of Gondor in the absence of the Steward? Gandalf.

I could go on but I think you get the point thart Gandalf through his wisdom of knowing what to do was absolutely key in insuring the One Ring was destroyed and Sauron ultimately defeated. Even if it was done without any magic, sorcery or military prowess.