Really? CoM seemed a bit more angsty and angry than KH1 Sora ever was. He was also like at least twice as more naive than the previous game what with him believing what Axel, Larxene, and Marluxia are telling him. I mean Sora didn't even know these strangers and yet even though he acted like he distrusted them whenever he saw them he still believed everything they had to say at the end of the day. I mean you could chalk up to be about him having his memories being muffled but still... This was literally the complete opposite of Riku's story. Plus, with Riku's story it actually makes sense why he would distrust the Organization members.KH1/CoM (Sora is pretty much the same in CoM as he was in KH1.) In KHII, Sora was very...generic shonen hero (I don't think the memory pod had air holes. It would explain a lot.)
He was better in DDD, sort of. He was way too happy, or maybe cocky is the word. He should have caught on quicker that something was wrong with the test, given how much he's been through.
THIS! So much this! However, I guess you COULD chalk up an excuse for his memories being tampered with throughout the game.I actually found CoM Sora to be the most downright illogical and irrational. He had less 'dumb and goofy' moments sure, but he made a ton of bad decisions left and right (though he was oddly somewhat smart in the fake card world stories). He pretty much willingly and knowingly put himself into a trap, yet was still shocked that all his memories of Namine ended up being a lie.
The CoM villains warned him of the consequences of moving through the castle every other floor, and he didn't listen. At least in DDD he thought it was just a test or part of the dream, so it's a bit more excusable.