Counter Strike 1.6, Half Life and Portal are just so ****ing awesome games! I played it years ago since my Steam-Account was hacked... I won't play any Valve game anymore, because I won't buy those games again...
I love Team Fortress 2 and Portal, but Half-Life 2 takes the cake. I like the story and protagonist, but the shotgun really sells it. I love how the shotgun isn't lame, unlike most games today. I'm also a magnum guy. Revolvers, shotguns and rocket launchers. Well, and the Zero-Point energy field Manipulator. Half-Life 2 rocks!