Yeah Roxas part is kinda lame on kh2 but as you dig deeper into game he became very important part of kh.My younger brother bought a fake $2.7 KHII CD for the ps2 and got bored of the Roxas segment because he thought the whole game was like that. Then I tried it and fell in love when I got to the dual wielding Roxas vs. Axel segment.
I never really like Chain of Memories i can't get use to card. and it was hardI saw the ads for it and wanted it, but I didn't have a PS2. So I had to settle with playing Chain of Memories (I was addicted to that game). Eventually I found a friend with a PS2 and KH1, and they lent it to me. From CoM I knew I would love the game, but KH1 just blew me out of the water with the intro video alone. After that I was hooked.