I played a couple of Mayhem Rumble matches and it was the most fun I've ever had in PvP... without a doubt. I used the Armamentarium with suppression grenades because nothing was going to survive more than a fraction of a second in my bubble anyway, so no need for Saint-14. Every time the heavy ammo spawned, I'd place my bubble, get my Raze lighter and uppercut every single sunsinger/bladedancer/defender... GGs weren't too much of a problem because I usually had a second bubble ready by the time they shot at me. It's pretty funny cancelling supers and abilities because people just aren't used to being so grounded and vulnerable. I'm not sure I encountered any Sunbreakers so I don't know how well I would've fared.