It's that gamepace combined with the bugs that made me not love S.T.A.L.K.E.R. although I wanted to

It promises alot but the endreturn is just a feeling of "not quiet yet"
Atm I'm playing Metro 2033 which is far more linear and scripted but it helps the gamepace tremendously. The survival horror aspect is also well implemented although the scripted content makes you jump only once in fear. As soon as you learn what to expect you just reload from a last checkpoint and try again with less fear. The checkpoint system augments the tension though. I prefer it to liberal saving anyware in these types of games.