I really don't see how you consider the story to weak either, just because you've seen something like it before? I hate to say it, but almost every Disney film involves the death of the villian....does that mean that you aren't crazy about those because you already know what's going to happen? What did you happen to think of Cars? In my opinion if Ratatoille is a Rip off of October Sky, then Cars is most definitely a rip off of Doc Hollywood. Just because I've seen the premise of a movie doesn't make the story weak to me. I see Bugs Life as not that different from Ratatoille. Ant has a dream of making things, leaves home, makes friends, comes back and saves the day. Everyone is happy. This premise is almost exactly the one in Lion King as well....Cat's Don't Dance from WB has the same storyline. Toy Story (1 & 2) really isn't all that different from Jungle Book or Monsters Inc. Those movies simply run off the buddy system of story telling. Finding Nemo is also a buddy system movie as was Lilo and Stitch...as was Emperors New Groove. Who didn't know that John Smith was going home in Pocahontas and that she was gonna stay behind? or...for that matter, who didn't know that the Titanic was going to sink at the end of that film? Star Wars doesn't haven't the strongest story either...boy yearns for more, leaves home, comes back as a savior and redeems his evil father.
It's not that easy to come up with something that no one has seen these days. I think that Lilo & Stitch was probably the most original thing that Disney has come out with in an extended recent history...but, then again, it is a buddy film. Pocahontas, Little Mermaid, Beauty and the Beast, Hercules, Snow White, Cinderella, Tarzan, Alddain, Black Cauldron, Pinocchio are all really unoriginal pieces...these were basically cookie cutter movies, but are considered (well, some of them) to be some of Disneys best stuff. Do you not like these ones either?