My buddy has a Kerran Monk and he is really happy with him. His starting stats were nice, the Kerran damage proc helps and with all the great gear availible, he is quite a good tank.
My human monk has about the same stats with gear, but when we duo, he and I are about equals in combat. I think his Avoidance is just a tad higher (about 69% to my 68.3%).
But I have to say, he looks cool in combat. Something about Kerran models just looks nice.