They've stated that, while classes will be able to work together and play to each others strengths, there won't be any clearly defined roles. I wouldn't expect a "tank" class or a "healing" class. I wouldn't even expect a class that can heal.

I love to play either the massive melee dealing huge armored clad warrior of doom, or the pansy holding a staff in white robes. - - looks like another warrior of doom for d3

I never played doom before cuz im poor

he means a warrior that destroys everything in it's path kind of doom. Not the game Doom.