Stalker was probably the best game I've played in while, in fact its the only game I've gone back and played through more than once in years. I have really been looking forward to Clear Sky.
I hate saying it cause it makes me sound like a fanboy, but everyone has different tastes and stalkers single player campaign really appealed to me, so I don't care if I can only get it via steam or if I have to drive to the store, I'm gettin' it