I see a flaw, it is missing arms and melee weapons. Sure it has a lot of long range and mid ranged weapons that could pack a punch, but it could easily get knocked on the ground, and this looks as if you are to use this to do a heavy push, but something that has more agility and spend can go behind it and decimate it. So this is like a German Tiger tank and something that is more focus on speed and agility could defeat it like a group of Sherman tanks.
What scares me about this aren't the miniguns, or the turbo-lasers, or the rocket pods, or the dead enemies. It's the NASCAR-esque ads on the Hammerhead, which I fear would be the end result if we ever get actual gladiatorial fights back.