Paladin out DPS brawlers on AoE content and your zerker should be at the top with the SK and I'm glad you guys aren't the ones balancing class. You don't tanks on giving more survavibiliti to the lower DPS ones, No one care about the top dps tank of he is the worst tank.
As for Zerker they should be T1 DPS with a 2hander using leather and not a tanking class. Since when a berserker isn't a big mofo in a stance of rage trying to murder everything on his way regardless of beeing attacked ?