Been playing it a few times with some mates, not had a chance really to get fully into it but from what I've seen the group/squad aspect is nice but I really dislike the GUI usage (space to select, etc), why not just have the mouse to select and do stuff instead of a mashup of both? Also some control mechanics at default are questionable.
Still, PVP should be a blast in teh final game, if they fix the gnarly bugs.
Someone correct me if I'm wrong, but you can use the mouse to select stuff on the GUI.