I've done excessive calculations comparing a pure monk to a dominator along with the Dominator's creator. The dominator comes out to be roughly 10-20 DPS higher than a monk in perfect situations (100% sneak attack, no fortification, no delay from haste boost activation.) Once you start considering "less than perfect" situations, then factor in constructs, elementals, undead, the Monk pulls ahead in all around DPS.
The Dominator can't even provide any monk buffs. It brings nothing to the party other than open locks.
12Ftr/8Monk builds are fairly common for the Kensai, but again, when considering all-around DPS, that build falls behind both the Dominator and the Pure Monk... but at least that build brings light path buffs to the group.
Here's a link to the raw numbers
http://forums.ddo.com/showpost.php?p...6&postcount=26