The Star Wars comparison has been done to death over the years, but I honestly believe that in this case it's pretty spot on. Before SW, you had many people (including crew, cast, etc) believing it wasn't going to be very successful simply because of how weird and different the whole thing was. I mean, you had a tall gorilla looking character based on the directors pet dog, little hooded guys with light up eyes, a bad guy with a breathing condition...Here you have a walking tree, a green skinned assassin, and a talking racoon...I could make many more comparisons, but the bottom line is that it really looks and feels pretty original. And that's a good thing.
Personally, it's THE film I've been most excited about this year.
Jason