KH1 was enjoyable, and hard to beat. That aside, I definitely got into the storyline. It was more of an adventure the first time around. As for KH2, the gameplay was more fun, I loved the counterattacks, and to me the story was better than the first Kingdom Hearts. I think KH2 is better by far.
I only found 5 Oricalchium+, and I can't figure out how to get the rest needed to get the Ultima Weapon. Also, one thing that drives me up a wall is I can't beat Sephiroth! He kills me in 5 seconds!
I used valor the most the first time I played, but now I find it fun to switch it up. The form that I recently discovered was final, and it's awesome. Probably my favorite.