Man was it short. At least it seemed pretty short to me. I ran it under DX 10 and it didn't look half bad. I thought the depth of field effect was awesome, very realistic. Probably one of the best, actually. It would actually adjust depending on what you were focusing on, it looked good.
I also liked the physics and effects of gun shots. When in the concentration mode, you could see the bullets impact the people and it looked very real. Their bodies reacted perfectly and you could see the bullet holes and everything. I liked shooting people with the arrows and just watch it slowly penetrate their skull.
Is it just me or does it seem like they've toned down the gore and blood (bullet holes in peoples bodies) quite a bit lately? FarCry and this game both allowed bullet holes to be seen in peoples bodies when you shot them, adding to the realism. With current games, you just don't see that anymore.