Monk

[AdrianCC100]

Anyone else think the Monk is really really strong?

[Resentful]

Every single class feels so strong simply because well for one It's normal and It's beta, In addition weapon DPS modified your abilities by a huge amount so of course you are going to feel like a Rambo at times.

I mean really you got the DEMON HUNTERS ARE THE OP thread here
BARBS OP
yada yada

In short - All classes are strong

[Shamburger]

I dunno...I went into the beta thinking that I was going to play a WD as my main but... I just played every character to 13 and quite honestly I DO feel the monk is the most powerful solo class (followed closely by the DH)

[Valeron]

In short - All classes are strong

This pretty much. I haven't found any of the classes lacking, at least from what I've played. It is all on what playstyle you prefer, which is what it should be.