I picked it up yesterday. Haven't made it to the dark zone yet, jut pretty much a few things done in Manhattan (2nd Map). Played the precinct siege in Brooklyn a few times, including on hard, and let me just say unloading almost a full clip into somebody's head while they run at you with a bat, and still nearly hit you can be a little frustrating, The more people you have the easier it is because the AI helping you blows. While easier playing with friends, watching them collect the good loot while you get the shitty loot is pretty frustrating as well.
Game was glitching a little last night. There's an issue when you start and try to activate your player, you have to restart the game and try again. Leaving Brooklyn had some issues with the door opening for nearly an hour.