Should have mentioned I'm pretty much only into fps games. Swords and stuff, boring. And dislike heavily.
You shouldn't ask for recs then.
Seriously, I'd argue that FPS is the worst of all the genres. If I were you I'd give all other genres a try because you're really, really, really, REAAAAALLY missing out.
Anyway, here goes.
BIOSHOCK IS MUST PLAY. SERIOUSLY. My favorite game of all-time.
BioShock 2 is good but not better than the godly BioShock.
Half-Life 2 (and it's episodes)
Modern Warfare 2 (great campaign, didn't try multiplayer)
Quack/Quack 2/Quack 3
Doom/Doom II/Doom III
Sniper Elite V2 (3rd person shooter)
Resident Evil Raccoon City
To be fair I haven't played half of the games I mentioned, but those are the most successful FPS I can think of. Borderlands and BioShock 1/2 are definitely good though.