Fully agree.
Initially, I tought only AoMC would be abusable, but after winning a N! AoB game in 6.32 minutes, it sounds obvious to me that I could abuse it to get 100% kill in N! AoB, or other things like this...
I don't know if many players would abuse this, but this is indeed bad balance, and should be corrected.
I won't exploit this, but I did play AoMC just to get arena pwnage medal, and usually take MAc & assemble Tac boots... where is the boundary between exploit and use of "non-overpowered" aspects of the game ? (well, way before MAc, imo :)