STALKER. Unbroken, without being modded. If you're a fan, this is basically what you've been waiting for - a fully functioning STALKER which combines the best aspects of Shadow of Chernobyl and Clear Sky and polishes them to a slightly creaky charm.
Only the slight sensation of datedness prevents this from scoring higher, and no doubt once the mods start flowing the value for money will get even better. But there's plenty here to keep the faithful feeling extremely optimistic about the prospect of a proper sequel. And there's still nothing out there quite like STALKER.