Hold your opinions on D&D Online until E3. Turbine has said they're going to use the Havok 2 engine to have full on collision detection. They're promising to make it feel as close to d20 combat as possible.
They're also only giving out XP for group missions. There won't be advancement from monster killing or soloing.
This is only a few things they've revealed from Game Banshee interviews. If they can throw in some DM tools then I see real innovation but it won't be for almost 2 years.
Hopefully it's broadband only...