I'm a 70 monk. Did most of my PvE as it. I'm not impressed, not the slightest.
Extremely difficult to handle and requires constant movement and rotation spinning.
As a samurai I dish out a lot more dps for a lot less time. The difference in the ease of playing is ... ridiculous.

PvP-wise monks do posses very high burst due to easy preparation.
You don't really need positioning there, you got decent self-heal, you got stun and a very nice double burst.
Monk is one of the few classes that can actually kill a healer 1 on 1 if the skills are timed properly.
Compared to Samurai monk is a PvP king, but it doesn't even come near to a DRK or a Machinist.

My advice is, if you want to get VERY good on rotation and positioning, make a monk, get it to 70, do some PvE.
It will grant you godlike mastery in rotation and positioning.

If you want to DPS in PvP, make a Machinist.
If you want to DPS in PvE, make RDM or Samurai.