Most disappointing 1.0 characters:
Tie between Buzz Lightyear and Syndrome.
`As others have said, Syndrome drastically needs the ability to fly, as well as enhanced zpe gauntlets. For example, Maleficent has abilities where she lifts npc's into the air and tosses them, which is exactly what Syndrome should be able to do, and NOT just to omnidroids.
`And Buzz needs to have access to his lazer, pronto. He should also be able to fly, or at the very least, glide.
Most disappointing 2.0 characters:
Baymax and Green Goblin
`Really hard to say. I like and am pleased with all of them to be honest. I think I was let down the most with Baymax, simply because after watching the movie, I was so looking forward to his special having something to do with his "destroy" setting, and those red eyes. I guess I was looking for a super power-up similar to Drax or Gamora.
`As far as Green Goblin goes, I was disappointed that his glider is just a pack that anyone can use. I guess that's cool, but I would have preferred that been his unique mode of flight; you just hold jump and he jumps up to be caught by the glider. I think it was a huge let-down for me personally since he was my most hyped character. He feels less special on it now :/
*For the record, Barbossa is my favorite 1.0 character, and Green Goblin/Maleficent are my favorite 2.0 characters (despite GG not having unique access to the glider).