Zer0's actually good, my brother seems to do a good job, i don't play as him so i can't say much, but he's also helpful for other players since he can make an attacking hologram while he goes invisible to run to safety or help fallen allies, and he and i are only level 18, there's many more skills down the road
So far the game is amazing, it's just sad that we both had to lower our Physx effect to low because our computers can't handle the new blood :(