Atlantis was far too suspiciously close to Stargate for me.
If you read some of the articles and interviews by John Lasseter, you see just how bad things had become at the animation studio.
All the animators were shut away in their own offices, too many studio notes, too much focus on making things commercial (promoting the brand) rather than just making good stuff.
They've since changed a lot of it, and the end result was Bolt. (Which actually wouldn't have been so great but for Rhino!)
I love Disney films, but they've always seem too reliant on adapting existing stories, rather than creating new ones.
And I hate hate hate hate HATE the merchandising they produce. Simpering Princesses (and not all of them animated!) without a thought in their vacant heads other than pretty things and social climbing.