Youll notice half the people killing your are the ones inside walls hiding and sniping from inside the walls. If you want to get revenge on them put on the perk that shows where the person who killed you last is if you dont beleive me. Also search youtube for the breach glitches and youll find them.
Also theres a lobby glitch where enemy team or the host can knife kill anyone at any given time. --- http://castleminerz.freeforums.org/index.php