I was on gridlock INCON and we had no mechanic, i put barriers in the middle to block enemies and the taps were there as well, i decided to be the designated repairer
I was able to kill enemies while repairing, i had my ultimate time perked so basically while i was repairing i would pop ultimate and enemies would kill themselves by shooting me, and the ultimate provided me with enough time to return to my base then i use my chaingun to get the ultimate quickly
Obviously, the medic is a great option as well but they still need to repair taps