All D1 and D2 cinematics!!! Even if you have played them already, its still a nice refresher if you haven't seen them in awhile. If not, the D2 ones should still make a decent amount of sense for those that never played it.
Diablo 1:
Diablo 2 + Expansion:
Edit: Also, if you didn't know, you can open up D3 and watch its opening cinematic and then the opening cinematics for each class (about 1-2 minutes long each). Which I assume play after making the specific class.
Diablo 1:
Diablo 2 + Expansion:
Edit: Also, if you didn't know, you can open up D3 and watch its opening cinematic and then the opening cinematics for each class (about 1-2 minutes long each). Which I assume play after making the specific class.
I did watch them a thousand times. But again, i did wait 10 freaking years for diablo3