[sarcasm]Huh? You don't know anything. Sirens and husks are the zerker's natural enemies. Zerker has to attack the husk and siren with a katana. At least that what all the "zerker isn't OP" defenders say. Oh, and crawlers.[/sarcasm]
Yeah, infinite penetration is extremely effective. The very quick "hip shot" which stuns a husk while killing or stunning everything in the path is a great use as well. Popping husks a great distance away on huge open maps is a great use as well.
Oh what now? If berserker choose the xbow, you can only choose between katana OR axe. No axe = really hard scrake kill. No katana = very hard trash kill. At least in this case, I dont agree with ghost.
And 36 shots for all husks sirens and crawlers? No. No gonna work unless you have a medic only paying attention to you.