Gears of War (Windows)
Dark Gritty 3rd Person Shooter based on the U3 engine and originally on 360
Emphasis on Taking Cover.
Great Graphics when going at its best.
Lots of action.
Single Play is Fairly Lengthy, 3 Difficulties Make it Longer (Casual, Hardcore, Insane) - Very Enjoyable
^^ 2 Player Co-Op over LAN or Online
8 Person Versus (4v4). Fun but I prefer the SP/Co-Op and mods over it.
Unreal Editor
Mod Support