Matt Damon -- Tom Brady's BETTER With Inflated Balls ... 'We Woulda Scored 200'

Matt Damon says Tom Brady is deadlier WITH a fully-inflated football -- and says if he woulda had a pumped up pigskin from the start of the AFC Championship, the Pats woulda hung 200 on Indy!!!

Damon was running around L.A. Friday -- proudly sporting his Patriots hat -- when he told the photogs Deflate-Gate is just a distraction from Brady's real DOMINANCE.

"Didn't you see when he got his real footballs back and he got 4 straight touchdowns ... I'm telling you we woulda won that game 200-0 if he had his regular footballs the whole time."

We'll see on Sunday.