It is very fun to play with friends, it might make it a bit easier at times, since friends aren't as stupid as AI... For the most part at least
Bullet drop and speed are really bad, but after you get to know the weapon/scope you can adjust easily. The AI has it's faults, but at least they won't walk by a body like nothing happen, which makes you have to think about who you shoot first and when, to hide the bodies from view.
Plenty to do in game and plenty of "hey guey!" going on. I only wished that we could put our own music on the radio... Getting into a car is a 2 step procedure, enter and turn off radio...