The Sith and other users of the Dark Side of the Force are unambiguously portrayed as evil (at least in the movies). It's taken as axiomatic that even if someone resorts to the Dark Side for good motivations, they will become corrupted and evil before long. The Dark Side doesn't seem to have any redeeming qualities or situations where it can be embraced.
On the other hand, there is also the concept of "balance" in the force which suggests that the Dark and Light sides are necessary and complementary. Maybe the Light Side can't meaningfully exist except in distinction to the Dark Side. Which would mean it wouldn't make sense to consider it inherently evil.
So, my question: is the Dark Side of the Force evil, or not?
By evil I mean: inherently negative, in every possible context, with no value to any being that is not malevolent.
EDIT: To clarify the above, some things, such as death, can be thought evil in the sense nobody wants to experience them but they are also recognized as necessary. Biological life as we know it wouldn't be possible if there was no death. The cells in our body are programmed to die, and hence death has a positive role in the life of organisms. It's not inherently evil.
On the other hand, other things, such as cancer, don't seem to play any positive role in biological life. Cells don't have programming to turn cancerous, they only do so when their internal processes are disrupted or go wrong in some way. Conceivably, a cell that "worked perfectly" might die but it would not turn cancerous.
So: is the Dark Side of the Force, as imagined in the Star Wars universe, more like death or more like cancer?