I'm unsure as to what your play style is, so I'm not really able to tell you if you would like it. What I can tell you is what I've gotten out of the game thus far. Now, keep in mind, I've never played D&D in any form, but the storyline seems to be pretty good (if you're into storylines), graphics seem pretty good, movement is different than CoH, but not that bad to get used to. The movement keys, in my opinion, is much better than CO or DCUO. I tried both those games and the movement method drove me batty to the point where I said "forget this!" and uninstalled them. If you're a D&D fan, all I can tell you is what I read, which is the devs have tried to pull lore in from the D&D pnp version into the MMO. Because I've never played D&D, I'm not sure as to how well they pulled that off.
As to what's irritating about it? Since I'm more a casual player, I can't really say that I found anything that irritated me that bad about it. Not any more irritating than saving Fusionette's butt every time I turned around in Faultline
The only suggestion I can make is try the Open Beta and check it out and form your own opinion
Open Beta is coming on Tuesday, April 30th