I do have canon quotes to back it up ;-)
Ford claims to be honoured to appear in Star Wars now.
As quoted in this article:
"It should have felt ridiculous!" Ford barked, when asked about returning to the franchise. "Here I was, doing something I did so long ago." I could feel the fans around me steeling themselves.
And then Ford paused, significantly. "I will tell you that it felt great," he said. "I was proud and grateful to once again be involved."
But he used to hate his role as Han Solo, preferring Indiana Jones.
From this article (emphasis mine):
But whenever the conversation turned to [Han Solo], Ford’s crooked smile tended to bend south and be punctuated with an eyeball roll. “He’s dumb as a stump,” the actor groaned.
[...] “He’s a cultural institution,” I said. “At no credit to the culture for embracing him as a hero,” Ford shrugged back, unrepentant.
[...] In 2010, when MTV broached the topic of reprising Solo (long before anyone considered that a remote possibility), Ford answered: “No, no, no. Han Solo was very good to me at a certain point in my career. But I’m done. I’m done with him.”
He hasn’t changed his tune much. Back in 1983, when Return of the Jedi was about to open, Ford was interviewed on the Today show expressing his dislike for Solo – and his determination not to play him again. “Three’s enough for me,” he said. “I was glad to see that costume for the last time.”
Rumour has it that he wanted his character to be killed off in Return of the Jedi, and even that Han was killed off in an early draft of the script.
But before Indiana Jones, he was more keen on Star Wars and Han!
During the first two Star Wars films (1977 and 1980), before he got his big break with Indiana Jones and the Raiders of the Lost Ark (1981), he was much more involved with the Star Wars effort and the character of Han Solo. From this article (emphasis mine):
Ford's mea culpa after viewing the finished "Star Wars" for the first time: "I told George: 'You can't say that stuff. You can only type it.' But I was wrong. It worked." Ford has never seemed at ease in interviews, but in this interview from 1977 he looks genuinely excited to be discussing "Star Wars." (Watch him gush over the opening shot of the film at 1:07.)
Ford's career didn't exactly explode after the release of "Star Wars." In an interview from 1980 that appears on the Indiana Jones Blu-ray set, he says that he didn't get the kind of scripts he had hoped for until "Raiders of the Lost Ark" came along. And the list of films he appeared in before "The Empire Strikes Back" (not counting a cameo in "Apocalypse Now") -- "The Frisco Kid," "Hanover Street" -- is less than inspiring. By the time "Empire" started filming, Ford still seemed to enjoy playing Han Solo.
Actually, the Ford depicted in Rinzler's equally fantastic "The Making of The Empire Strikes Back" seems even more invested in Solo. "Empire" was a much more grueling shoot than "Star Wars," but Ford wasn't just along for the ride. "I think of myself as an assistant storyteller," he said at the time, and there's no better example of that than his debate with "Empire" director Irvin Kershner over the carbon freezing scene.
In the script, Solo's response to Leia's declaration of love for him was written as "I love you, too." It's now lore that Ford changed it to "I know." But if you read the transcript of Ford's conversation with Kershner on the set, you can see that Ford wasn't just being a smartass. He put a lot of thought into that line. "But if she says, 'I love you,' and I say, 'I know,' it's beautiful and it's acceptable and it's funny," he pleaded. "The point is, I'm not worried about myself anymore; I'm worried about her."
This does not sound like a man who didn't find his character "interesting."
Even while promoting "Empire," Ford still hadn't yet developed his gruff attitude toward "Star Wars." Again, he actually seems relatively excited to be talking about the movie. (That would change before "Return of the Jedi" was released.)