[QUOTE=Astronite;2097284]
Zone of Enders: The Second Runner.
Breath of Fire III:
Classic story. Great characters. Memorable settings. What more can I say?
Yes, really the entire BoF series in general.

Secret of Evermore ~ I don't know what it is about the game, but I loved it the first time I played it, and have played it many times sense, and still love it.

Well, I would say Ico, but after SOC, suddenly everyone knew about the game ( and claims they had the game all along, pfft ).
I agree Dreddz. Ico was fantastic, and I'm glad that SOC brought more attention to a great game, but nobody likes a hypocrite. Some game reviewers were guilty even; gave it a bad review when it came out then praised sony and Ueda to high heaven when it became more popular and won all the awards.

Ace Combat series ~ I guess it sells well enough to not be considered underrated, but nevertheless I think it's underappreciated by the gaming community in general. I especially like AC4. Namco has a certain style that I enjoy. I love Soul Calibur's fighting, and I think they did an ok job with xenosaga(though it doesn't do xenogears a bit of justice).

Klonoa 2 ~ another Namco game, and it's incredible. I don't know why I even bought it in the first place, as I'm not much of a platformer, but I'm glad I did. It reminds me of a game on sega saturn that was an incredibly inventive platformer. Can't remember the name of it though.