If you are rich enough to have grief + anni + torch, Berserk is the way to go. The entire reason to play Barb is find item and elite sniping. WW/Frenzy is okay for lower gear levels cause you have access to sustain, but let's be honest, if you wanted to aoe down density, you'd play pally/sorc/trap/zon. Berserk has the highest damage for minimal points invested. It deals magic damages so you almost never have to worry about immunes (physical in particular). It's downsides are no leech and no aoe, but if you are geared you are you trying to kill the council in 1-2 shots each or kill a champ and howl pack and move on. Griefpb + 42 ias total (grief inc) is 2nd highest bp. Berserk doesn't count off hand for damage but it does care for speed, so you can use stat stick (6 ist pb, 6 lem pb, Stormshield, rhyme for cannot be frozen+mf). Overall, I'm not sure if pit zerking is even that much more efficient than other classes in the new 85 areas for MFing, however for players 1, trav horking for RUNES is by far the most efficient run. In which case, focus on survivability and damage, cause there is no game creation timer. TLDR: Go Berserk for trav, Grief PB + stat stick/shield, make sure you have 42 ias total)