Nothing about Monks. Seriously, the most broken thing in this game, the biggest failure by design is a playable class, and tons of them left the game or swiched character because of this.
That's why, in the lead up to 1.05, I levelled a Barb. It's a sad end to a character I put 160+ hours into. I still believe Monks can be good, but after playing a Barb, you can see why a Monk doesn't provide the same kind of value.