Putting peoples opinions on other games aside, I quite enjoyed what I played of this over the two weekends it has been playable, I think that the biggest draw to it for me is the DM module creation tools which allow you to create you own quests, NPCs, enemies & dungeons & then either play them yourself co-op with you're friends or you can DM the game for a group of others influencing the action in the background or by taking control of any NPC.
The possibilities are endless if the community embraces the tools.
That will only be any good if the underlying mechanics are any good. With people saying that this is a heavily cut-down D&D implementation, I'm not sure I care how much user generated content is possible.
If the basic mechanics suck/are dumbed down, then the whole game is dead to me, no matter what DM tools they have.