I played HU about two years ago and I only played Barbs (zerkers, to be exact). Many bosses cast IM and since player damage is greatly increased (to somewhat compensate for huge monster life increases), WW/Conc/Frenzy vs. IM = bad. I'm planning on going Zerk again, but many things have been changed since I played last so I'm really not sure what to expect.

Check out the official forums to see what people are doing. Apparently, golem necros are good as you can have all four out at once.

By the way- Act 1 mercs OWN! They cast multishot and with helm/armor each with 3 max dmg jewels, they do way more dmg than my barb.

And gambling is blatantly abuseable- gamble wands/staves/scepters for ~2k and sell for max sell value (as long as the have +individual skills) FTW!