AI Wars - Awesome...but its definitely not for everyone. Really trick AI & game style. Unlikely other RTS games here you can't kill everything in sight. The AI gets stronger if you do that & eats you alive. Has to be guerrilla style attacks or going only after high value targets.
Torchlight - Awesome. Really impressed with the art direction. They basically fixed everything that was wrong with diablo 2 game mechanics wise.
Stalker SoC - Still undecided. Looks vaguely promising. Out of the box config is 100% unplayable though. Had to edit to configs to get rid of the weird lag.
Defense Grid - Awesome. Bit repetitive after a while, so I'm alternating it with the others.