Just an enormous, highly detailed, impressive game in every way. This is why you bought an expensive GPU!
Of course, great DX11 implementation as well.
Also I just haven't been into FPS games these days, so this was a breath of fresh air. A little action mixed with lots of exploration & a few puzzles. It all seems well balanced for those looking for this type of game.
Environments are insane! You can tell so much work went into making this game & I hope the game is a blockbuster money making hit so that they can keep churning them out.
I use the wireless 360 controller for PC, which works great with a game like this.
Impatient people probably can blow through the game fairly quickly, but if you are like me & want 100% completion then there are plenty of hours of fun to be had. I think everybody should support this game & give it a try. No doubt that you at least get your money's worth.