[PS2] Must Own PS2 Games, or how many middling JRPGs can you suggest?

Gitaroo Man - Think Parappa, but with guitars*. Ok, that description may be a bit crude, but as far as music games are concerned, Gitaroo Man absolutely cannot be missed. The gameplay is slightly different than usual, in that you have Charge, Attack, Defend, and Harmony phases that split up the song. It's kind of rare, so your success finding it may be low, but the game is a blast from beginning to end.

Metal Slug Anthology - Not sure if you're familiar with the MS series, but this collection covers everything up through 6. A run and gun arcade sidescroller from SNK that's got some of the best sprite animations I've seen to date. The titular Metal Slugs (tanks) are awesome as well. It's much more fun if you've got someone to co-op the games with though.

Nthing the Ace Combat noms, and God of War.

*In before Um Jammer Lammy.

Jam it back in, in the dark.

Your point?

There's nowhere I can't reach.