I...errr, got an advance copy.
The game is mildly entertaining, I'm sure Multiplayer will be fine. But it's not GoTY material by any means. The AI is sloppy--I watched one of my own men shoot at a wall away from the enemy for what would have probably been forever had he not been shot in the back--the level design is sloppy, the aiming seems off, wall piercing bullets seem to have been toned down (maybe realistically) from 4.
It feels kind of like a crappy mod.