Left 4 Dead is not survival Horror. It is a horror themed first person shooter. However, its atmosphere lacks the subtlties required by the genre, and the monsters are all in your face and stuff. Dead Space, however, is somewhat a Survival Horror. It nails the atmosphere, but is more of a strategic third person shooter, gameplay wise. However, it does effectivley convey a sense of dread, and has some very intense "holy crap, how am I going to survive this?!" moments.
Edit: Ultimatley, I would say that L4D is a first person survival game with horror elements, and Dead Space is a third person shooter/ survival horror hybrid. Games that are truly survival horror, to me, are ones like Silent Hill Shattered memories (I know it wasn't all that scary. However, you must run from your enemies, and use the environment to save your bacon. That is very survivalish.) And the old style Resident Evil games. (Particularly REmake.) They forced you to conserve ammo, and think about whether or not you should fight. I haven't played any of the old Silent Hill games, so I can't really say.
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