I absolutely loved playing Re: CoM. I loved playing the original, and though I haven't finished either game in their entirety, I still consider them to be so much better than KH2.
Some people might find the card battle system to be a hassle, but I loved it.
I loved having to think ahead. Finding all of the cards, and then figuring out which combinations would work the best for me was so refreshing from having to button mash X and now sometimes Triangle to get anything done. This actually made me use my brain, which meant that it was actually working when I got to the cutscenes.
And the plot... oh, the plot was wonderful. They included the worlds in such an innovative way that it didn't feel like I was just going through the plot of KH1, even though we were using KH1 worlds. And with the fact that we had to synthesize our rooms, it really brought back to me how we had to synthesize those weapons and armor in KH1.
With the inclusion of some of the members of Organization XIII, including my favorite, Zexion, it made for a great blending of old and new characters.
KH2... was just disappointing. I felt that I was watching the movie while playing, and I hate that. If I wanted that, then I would have just watched the movie. Plus, they didn't include the worlds into the overall plot, except for some, like Space Paranoids, Land of the Dragons, and Beauty and the Beast, to some extent. It felt more like we went to the worlds just to catch up, instead of saving the worlds.
CoM just... it was the best out of the latter two. It had its drawbacks, like all games, but out of all three, it's the one that I'm most likely to play over and over again.
Then again, I'll play all of them over and over again. But I'll play this one the most and enjoy it the most.