I don't expect to see intros during random online play. But when I'm in a party, we usually let all of our intros play.
The thing about the intros is that they lose their novelty fast. Most people probably have seen all, if not, most of the intros so that element of surprise or freshness isn't there. Now if SuperBot wants to release intro DLC (LOL!) then that's a whole new ballpark!
Drake entering the battle field with Elena and Chloe on his arms, anyone?