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A six-month review of D&DO can be found at GameBanshee and updating their official April review. The score is 8.2/10 and here's a snip:
Let me start with the quests. When DDO shipped, it only had about 110 quests in total, and those quests weren’t nearly enough. To make it to level 10, players had to repeat quests numerous times, and then when they created a new character, they had to go through the same sequence of quests, repeating them again numerous times. But now there are something like 135 quests, and the problem isn’t as bad. You might take a character to level 10 and not complete a few quests, giving you something to do with your next character. Still, DDO could use some more quests. Heck, it could use a whole new town.