Underapreciated games, What's on your list? Options

[unitself]

So, I was buying a used game today - Shadowman 2 - and I was thinking to myself, "I loved Shadowman 1 for the DC, I hope this game is just as fun." Which then caused me to ask tis question to you guys.

What do you think are some underapreciated games?
or even games that you like, for whatever reason, that really no one else liked
I know these questions are tired and old, but play along anyways.

My list -
Shadowman (DC).
Good adventure. Good story. Excellent and creepy sounds. Not too hard. Good length too.
You are this guy who's littel brother is killed and you get "cursed" to track down several serial killers. Part of your curse allows you to travel back and forth between the living world and the dead world.

Another one was this tank game called Wild Metal (DC).
It was slow as hell and not very exciting (ie: fast), but I played it all the time. Mediocre 3D graphics hurt the initial wow factor for most people I would imagine. Still, I loved it.

More to follow....

[unitself]

So it turns out that Icrarus is right.
ICO is way cool. Looks great too. It's even nice and mellow which I really like.
It kind of reminds me of Soul Reaver. In the same way where you had to travel back and forth from both worlds in order to solve the various puzzles. Not in any other way... just the puzzles part.
Anyways... like Icarus, I would recommend ICO.

side note - I also bought Katamari Damacy. Man oh man, is this game cool and fun. Strangely enough, it reminds me of a game that could have come out on the Dreamcast. The whole premise is just so odd! Excellent music also. Seeing as how I don't know anyone else (besides Icarus who I talked with before buying this game) own Katamari Damacy, I can safely say that this game belongs in this topic.