I know that Dead Space is very awesome. But once you've beaten story mode once or twice, you're done. Left 4 Dead is multiplayer though, so you will get more out of it. But I haven't played it, so I can't really talk about it.
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oh mannn left 4 dead is soo ace online wiv ur m8s were were all like ay cmon b dnt shoot the witch shoots the with bloody ell b yeh the ol fackin bill is full on crazy
I initially regretted buying DS and it gets cooler as you progress but it's nothing amazing and Valve made HL2 and it is epic so try L4D. Graphics, sound, lighting wise then you're better of DS.
This. I should've rented. I always rent games if they are out of my comfort zone and the first time I didn't, I ended up being right. EDIT: Both look like rentals unless you play L4D online. Then it's a keeper.