Hahah... if you consider Borderlands to be innovative, then STALKER will knock your socks off. (Well, maybe, but in a different kind of way.)
The STALKER games are the most immersive, most atmospheric, most challenging games I've ever played. I'm not sure what else there is to say. As often as I get frustrated - just because of how plain difficult it is - I simply can't not like it, because the atmosphere, the the setting, and the enemies are so goddamn brilliant.
It doesn't have the RPG elements that Borderlands does. There's no leveling up, no skills, no special abilities. STALKER aims to be much more realistic than that. It has realistic environments and physics, weapon degradation, handling, ballistics, and damage. A single bullet to the head can kill you. There's no stats or "second wind" to help you out. You're just... dead. But it all adds to the realism and immersion that is STALKER. Unlike Borderlands or Fallout, STALKER is considered to be the only true tactical-shooter RPG.
I know "immsersive" is a buzzword that's thrown around in the video game industry a lot, but in this game, it's really something else... something huge. After you've spent a few days trekking across the dilapidated, anomaly-infested fields of post-disaster Ukraine, you'll know what I'm talking about.
It is absolutely necessary that you install the
complete mods for full experience. It fixes all the bugs, and improves the game's AI, graphics, audio, and just about everything else.