S.T.A.L.K.E.R.: Clear Sky - Review @ IGN

IGN already has  their review up for S.T.A.L.K.E.R.: Clear Sky and they give it a 7.3/10 score, with a lot of positive points but their main problem being bugs.

Here's the conclusion:

...The first game presented a very unique experience and, by and large, Clear Sky sticks close to that model. So if you liked the first game because it was big and dense and scary, then you'll like Clear Sky for the same reasons. And if you like the original but wish that it offered more GRAW-style action, then Clear Sky is even better.

Not everything works, of course. The faction fights seem too easy, which is balanced out, we suppose, by the ridiculously accurate grenade throws. The story doesn't offer much of a foundation for the action, either. The real shame of it all is that the game was let out the door with so many bugs, some that merely slowed our progress and dampened our enjoyment, and one that actually stopped us cold. Many of these issues are bound to be addressed in upcoming patches but we'd wait until the game has at least a few under its belt before trying to tackle it again.