Sincerely, what I have learnt till now it's that you have to focus on what are you planning to do with pools of monters, and I understand this two:
Finishing one by one with one or two hard hits.
Finishing groups by multiple hits that maybe you need four or five hits
This two changes totally your way of playing with monk.
First one, needs to move really really fast between monsters, having extra effects on hits (critical, extra speed, reduce movement from enemies, etc).
This is more likely "mark and kill" style.
Second one, what you need it's constantly doing damage, every single second with sweeping wind and hit, and hit, and hit, beacause you need several hits to finishing the job.
This is more likely "let them come to me"
The truth is that the first one is pretty cool, but you have to be very fast thinking and clicking selecting your victims strategically. Also most of times monsters aren't waiting for you to select them to be victims.
The second one is more "easy" to play because monsters usually sourround you, so you just have to move a little bit forward to center, and start clicking AoE tecnics (Crippling wave). The only proble is that you need some "panic" exit system (serenity with healing rune) to get out of there.
So in my opinion, monk is an AoE character like a tank, but more than a high dps character, its more like taking advantage of debuffs enemies.
BTW right now level 36 I'm using this build:http://us.battle.net/d3/en/calculator/monk#Wcgfih!ZXY!ZaaZZ
And I have to say that I didn't have problems on playing solo on NM, neither die even on big hero monsters groups.
One tip, Dexterity the highest you can on your gear (right now 818)
PS: Well, maybe this is my first post on D3 forums so don't be to hard :P