I've been playing some of the new character and am still trying to get my head around it. Easily the most difficult character to play (only managed to get to act 2 one time). Most of the other characters seem to have two things to juggle: Ironclad has strength and block, Silent has poison and shivs, Defect has orbs and zero cost cards, but the Monk seems to have loads. You have Stances - enter rage to get double damage BUT take double damage and Calm where you get extra 'mana'. Various cards are effected by the stance you're in. You have divinity, where if you get ten you get triple damage until the end of the turn, and then there's numerous cards which when played shuffle an expendable 'uber powerful' one shot card in your deck.
There's also the 'retain' mechanic, where certain cards get stay in your hand and get more powerful if you don't use them, and miracle cards. One shot cards that give you an extra mana point (the Monk starts with one every combat).
So yeah, it's pretty tough. Requires a lot more thought than the other characters.