I liked Dream Drop Distance, but I have many issues with it.
I'll start with my main issue that bugs me to no end every time I play it. The frame rate drops. This game has got to be the worst in terms of frame rate, to the point where sometimes a button press will not register because the refresh rate is so low. This is especially apparent when I have the Circle Pad Pro attached.
Some people might not notice, but if you are one of those people, go to the tunnel (not the cave, the sort of twisty tube thing) in Prankster's Paradise as Sora. The frame rate stays at a smooth 60fps for the most part. It's kind of jarring tbh.
Other minor problems have to do with the game design itself. I hated the Pokemon Aime ripoff with the Dream Eaters. It brought the pace of the game to a screeching halt and it was dull and repetitive and not fun at all. I also hate how the Dream Eaters are in charge of what abilities you have. Like, not only do you have to have certain Dream Eaters with you in order to have some abilities (which is a WHOLE OTHER CAN OF WORMS), but I hate how you have to level the DEs up in order to unlock said abilities. This drives the whole Pokemon Aime thing home. It takes way too long to get points to unlock new abilities.
Then there's not much to do after you beat the story. I'm of course glad Julius is there, plus there's a fairly good amount of trophies to unlock, but I was expecting a bit more. Especially with all the extra stuff that can be found in 358/2 and bbs.
Another minor complaint is that the worlds you visit seem lifeless. There's just something about them that I can't put my finger on that is a little off-putting to me. This is especially apparent in the TRON world. I never look forward to going to that place.
Contrary to most people, I actually didn't mind the Drop mechanic at all since there's a little thing called Drop-Me-Not. I always have some on hand. I also don't have a very strong opinion on Flow Motion.
Also Sora's voice is annoying. I don't care if it wouldn't have made sense, but I would have much preferred if Haley Joel Osment didn't force a younger-sounding voice out.