Hi guys!
I made a barb reroll and i looted a legendary weapon : Boneshatter. This is a 2H mace lvl 14. I tried it and i made massive critics with it! I only got 4k dps with my lvl 28 barb and my crits are over 22k with Cleave and more than 74k with Hammer of the Ancients. I tried it on my main lvl 60 and i got the same crits than my reroll.
I use a ruby on the socket of the weapon. You should try it if you got a reroll, you can easily xp with this dps (it wont be written in your char's details).
Edit : Seems working with not all of those weapons but only several. I can't find which bonus you'll need to got this bug. I keep working on it!
Edit 2 : Sorry for my bad english, i'm doing my best!
Enjoy!