I am a fan of AC2 (was my first mmorpg) and really enjoyed that game. Had a sorc up to lvl 56 before I moved on to EQ2, WOW, etc.
I was pretty excited about this game since AC2 was a really unique game. However, I think I am a little dissapointed in the gameplay of DD Online.
I think my biggest complaints is that the gameplay mechanics are quirky (you've seen it before - the sit n' spin, moonwalking) and there are too many Pen+Paper game restrictions that seem strange in today's mmorpg online world. Stuff like not being able to regenerate hp unless you travel to an inn. The artwork is not the best either imho.
As always turbine has added some interesting things like bringing back the old on-screen text descriptions of things that the player should pay attention to: "Dusty footprints lead you to believe someone has been here recently", etc. which is a nice twist to the WOW hack n' slash philosophy.
Overall I think I was expecting something a bit more. Like AC2 I think turbine made another diamond in the rough. Although there is a diamond here, it seems pretty unpolished still.