You guys are missing the point. No one is claiming Mauls are OP in duel situations, and they are probably balanced in an open group battle situation.
They are just totally, ridiculously OP in siege. Just because it's not abused 24/7 doesn't mean it's fine. Whenever a clan or group of randoms decides to put 2 maulers on every ladder, attackers have no choice but to pour into the meatgrinder like lemmings and hope eventually someone gets through. Any weapon that allows a naked newbie to top the scoreboard while performing only a single attack without even moving needs some adjustment.