I dont want to act like a blizzard's fanboy (well, I'M a blizzard fanboy mmm...

), but when i see what some ex. blizzard north employees have done recently (let's say...Hellgate london ?), this argument proves nothing.
Yeah, remember? The former Blizzard north employee, mainly lead by Bill Ropper, are proud to release Hellgate-London, the new and best hack&slash in the universe blablabla... Guess what ? I was decieved. A LOT. Bad balance, buggy, and having to pay a monthly fee to profit the full game? And this was the baby of the "so all mighty" Blizzard notrh employee?
No, people move, want to try new thing. Some have success, others fail (Hellgate london, back again).
Another exemple? Castaway Entertainment, founded by some ex former Blizzard north devs, just suspend their operations. They were working on a diablo-like project (Djinn). ()
There is no secret in making a good game : good ideas, hard work, more hard work, no time limit/deadline forced by some ****ing publishers and A LOT (should i repeat ? A LOT !) of polishing. Regarding the ideas, you need some creative artists, that's not something reseved to the personn you have mentionned above. I would even say that with fresh blood, comes new/unexpected ideas and innovations. Hard work and polishing ? well, just look others Blizzard's games (Starcraft, Warcraft, WoW). Dead line ? Blizzard is probably one of the few studios not being worried by its editor (Vivendi) for an now-and-immediate release...
They get all the ingredients for making Diablo 3 a HUGE game. Let's trust them as we have trust them for Warcraft 3 ,WoW or Starcraft 2. By the way, Metzen is still there, so i m not really worried about bad lore/scenario/story.
And the day of Diablo 3 release (because i'm sure, 29 june will be THE day of the announcement of Diablo 3

), we will all be crying and yelling about how godly the game is. (And for myself, i will laugh so hard about Hellgate and his greedy-****ty paiment system...

)
Hope to see some of you at he WWI
Regards from France.
Mick.