While I doubt any who have played DDO for any length of time would disagree, the game does definitely have its faults (usually around update times its most notable for bugginess). But given a little tolerance and understanding, the game does provide a thinking experience.
Graphicly it isn't as demanding as many newish games out there, but that doesn't prevent it from producing some very stunning vistas and effects, although over time you tend to loose the thrill of the effects. On the whole the game is not static, with content and systems updates (free) monthly and modules (3 and 4 times the size of the updates) every three months, it is slowly but surely growing and developing.
While in places the game does divert from the 3.5 ruleset that it was to be based on, many of those inconcistancies are being toned back and brought into line with the ruleset.
While not recommended for the 12 hour a day power gaming grinders, there is enough to keep even them busy for months, just attempting to get that special peice of armor you've been looking for. For the casual player, there is always something to do even if you only have half an hour.
Combat and game play require quick thinking as much as reflexes, tactics do play an important part and stopping to think may not be possible in many places.
To those who have the desire to really join a community of vast experiences, you have it (and in intergrated voice if you choose).
Well worth the look.