There were 6 on the nes, on the ps2 you had things like Final Fantasy X-2 and stuff
Ah right, forgot that it only went to 6 on Mega Man on the NES, thought it was just Mega Man X on SNES. For Final Fantasy, there is X, X-2, 11, 12, and Dirge of Cerberus.
Guitar Hero might make it there with that for sure, though I'd probably exclude 80's which was basically just a stand alone song pack, the band ones actually had a little effort into them with including band members and doing mo-cap and stuff. Think I only need two more and I have all the PS2 releases.