You dont have to spoil their quirks to make them look interesting. They could've also shown the ones we already know or atleast frames from several showdowns like they kinda did with Deku vs Shinsou (which wasn't very creative, Deku flying towards him).

I'd agree - the same calm before the storm feel with last OP. It makes sense that this one is less visually interesting than that one though - if they don't want to spill the beans on everyone's powers, and wants to show them off throughout the rest of the arc.

Altho, why they couldn't have done more interesting directing of the visuals like last OP, is beyond my understanding. Perhaps because of the upcoming movie, taking resources and / or time away?