You mean at Barca? Tbh, I can only recall a single time this season where he played RB, and from what I remember, he didn't perform too well there. I could be wrong though, don't remember anymore which game it was.
He only played there once, but we were all impressed, some quotes from the match chat:
"MAANNNNNNNNNNNN this guy is playing some sublime sh!t!"
"That play where he beat the defender and made the backheel pass to Messi... beautiful!!!"
"is he more defensively solid on the right?"
"He looked comfortable today and played very well. He played with the potential he's had from the begining. The only bad thing he did was get a yellow which shouldnt of been a yellow in the first place."
"Very nice display from Maxwell. It's good to know he do a good cover for both Dani and Abidal"
"I was sincerely delighted of seeing him playing such a wicked game. Messi should have SO scored from their interplay, which was just so sweet one could almost taste it."
"our best signing this summer"
etc.
Maxwell is a very versatile player and I think he's a fine backup LB/RB.