In my opinion D3 is not an MMORPG
Websters online dictionary states: They "...allow thousands of gamers to play in the game's evolving virtual world at the same time via the Internet.
Now this brings up two topics of debate, *Useing wow as a MMORPG example.
1. Evolving Virtual World?
-WoW's world has evolved from when it was in vanilla
-Diablo 2 had a new act when the expansion came out is that really an evolving world? (D2 example for lack of playing D3)
2. At The Same Time
-In Wow you can have a thousand+ players on one realm (or world)
-Diablo 3 can only have 4 people in a game... but can have thousands of people playing their virtual world online... so does that count?
If you include a "perpetual world" in your definition then D3 is 100% not an MMORPG considering the game world does not exist unless someone makes a game.