It's surprisingly fun and different from other MMOs.
The main difference for me is the quest system. For those who don't know it:
Unlike in other MMOs, in DDO all quests are instanced missions with their own story and "plot". No "go and kill 10 spiders in the wilds, then come back".
Sometimes, there even are instances within bigger instances. Quite nice
The graphics do their job, nice atmosphere, nice sound.
Also: Spellpoints/MP instead of memorizing spells, which is what it should be anyway
The only thing that bugged me so far is that, once you reach The Harbor, you run around in sewers after sewers after sewers after warehouse after warehouse after sewers... Especially annoying when you try to solo.