Now, mind you, this does not include Pixar films, but Disney studios produced and designed animated features.
And I expect more than a few out there will disagree: that's fine. Merely for me, Atlantis was fresh and something wholly different that Disney had never tried before: a sci-fi tale, not based on classic literature or a fairy tale, and in a more modern setting (1914 versus many 'timeless' or fairy tale type stories). I found the style, mixing kind of a film noir sensibility at points, a hearty helping of Jules Verne steampunk inventions and monster pulp, classic sci fi/hidden world style elements, a kind of Dirty Dozen style "specialists on a mission" plot and comic book style adventure (aided by designs by Mike Mignola), to be refreshing and a lot of fun. The music composed for the film was rather lovely and interesting, I found, and I always have fun rewatching this film. There are a few missteps (Corey Burton's Moliere as too broad comic relief among them) but for me, this was even better in tone and execution than Princess and The Frog (some good songs but uneven, loved Dr. Facilier) or Tangled (sweet and definitely in the classic fairy tale vein, but nothing very new) on the strength of vision and working within a genre I greatly enjoy.
Yet, I know my opinion is in the minority: the film had mixed reviews and didn't post at all blockbuster numbers or revenue for Disney, and it seems kind of off-handedly lumped into the category of 2000's "slump" Disney animated films along with Home On The Range, Treasure Planet, Chicken Little, etc. I merely think it is leaps above all those in being fun and re-watchable, and covering new territory for Disney in animated format. It is a slightly rougher film (death and explosions occur more frequently than in any other Disney animated feature and it has the 'monster parade' segment of various unlikely beasties) but I think those add to it's strength and originality. So, what is the consensus out there: am I alone in my love for this movie, or does it have other devotees?