I have to disagree with the fact that we Zerks can kill "anything".
My Zerk has 210 AA and Tier 2 armor, Masters/Experts, and a Fabled Myth. While in BG (Smugglers) i attacked an SK who was afk. For the next 15 secs i couldn't land a single blow on him. He finally got back and instantly wiped me. Curious to see his armor, i decided to look him up on eq2 players. He has Tier 1 armor and a fable as well.
We're are a very underpowered class. So unless you're in a high powered guild with tier 4 armor, myth, and max AA, then prepare to wait for hours until you finally get a group going for your average instance/contested dungeon.
That's why you hardly see many Zerks, and more so 50 SK's running around on most servers. We just aren't worth it.