Im not sure about lower levels but, I'll copy this from another related topic.....
If you want plate that does DPS and tanks good I would go with a zerker.
And if anyone ever tells you a Zerker cannot DPS, tell them to shut it :) So if played right you can average parse over 2k with a zerker ;p
(raide-wide parse for Freethinkers)
Allies: (18:06) 26547288 | 24445.02 [Kahlanna-Manaburn-59543]
Ducane 2515940 | 2466.61
Trufax 2262312 | 2339.52
Varsh 2110458 | 2153.53
Valthor 2110174 | 2116.52 <---- bezerker
Kason 1994196 | 2326.95
Kahlanna 1755689 | 1793.35
Kamahameha 1547448 | 1658.57
Kalavar 1536761 | 1605.81
Dakkota 1530183 | 1746.78 <--- LOl me a wizzy?
No, I didn't have illusionist buffs or a troub but, thats still really nice for a zerker.
I don't know too too much about the other tanks but, I know a zerker played right can lay a smackdown indefinetly.