Played it on Uber difficulty and breezed through it, enemies can't shoot for sh*t! Multiplayer mediocre.
Although your veil powers are pretty cool to experiment with it just makes the game far too easy. The only time I met a slight challenge was some boss fights, most of the time its just cross-eyed half blind nazi's to deal with. As for the story itself it does not do a good job to grab too much of your attention.
Everytime I play a first person shooter online, I always find myself comparing it to Call Of Duty. The basic concepts are good but the one thing that really bugged me was how hard it was to kill. I near finished off an entire clip of my MP40 before the player bit the dust.