Son of a Gun
This title is really a big winner. You can play it for long hours and not get tired of it because it doesn't get boring.Of course Counter-Strike is the all time winner: with its adrenaline pumping at 120% every second, but with this one you have better maps (of course, it's a new engine & most sofisticated graphic details), and you can have real strategy to get there. You can be a sniper & sneak around for minutes without being seen (imagine that in Half-Life CS, na way). You can fly airplanes, jump out in your parachute, and start firing just like CS.I love it, it's a shame we have very limited options in terms of multiplayers servers down here in Brazil.