ANYTHING that has a SHOOTING part in it has my attention from the get go, In no such order on my desktop right now is ALL the Stalkers, Metro 2033, Far Cry2 ALL the Half Life games, Both borderlands, Both Bioshocks, Just cause 2, Both Portals, Deus Ex Mass Effect 1-2, Hard Reset, left 4 Dead 1-2, Fear 1-2, Rage, The Saboteur, etc.
Racing, there is 2 Tracmaina's, LOVED the Gran Tourismo stuff when I had Playstation.
World builders are of course Minecraft, Stronghold castle series, HAD all the AOE stuff got tired of them.
Just for fun since Matt had to show off, here's a few of my builds on craft. I have ton of other builds these are just the ones I have screen shots of.
My Automatic harvest Wheat farm, does about 15 stacks of Wheat per harvest.
My Mob farm/Grinder I need to get a vid of the thing its angry sounding.
Original Spawn House, basically carved out of a mountain.
Swamp house
And the Castle, because everyone has to have a Castle.