Sure, you hear about Halo, Call of Duty, Fallout, etc. But have you played any good games that aren't popular/are underrated? For me, I would say Katamari or Civilization 4.
It's a ps2 game that is similair to the most recent Oblivion.
First person RPG, fighting isn't turn based or anything it's live, grpahics aren't amazing, but the combination of the music and the lighting can create some real SCARY moments in parts of the game.
A starship-shooter game that involves using the gravity around you as a shield, and as a weapon. 20 enemies surround you and give it everything they got. You use the gravity field, all the lasers and bullets get sucked around your ship. You can either reflect the bullets back at the enemies, or absorb the energy created by the bullets to generate an enormous shockwave to devestate the entire screen. Your laser strength goes up by about 20 levels, there are multiple kinds of ships to choose from, and there are FOUR HUNDRED things to buy in the shop.
-- Sega Dreamcast (r.i.p.)
2. Live a Live
Turn-based RPG game that involves 7 separate storylines from 7 completely different characters. Play their history, then bring them all back in one time period for an all-out struggle against time, space, and the universe itself!