He is very good when he does those anger-solo runs.
But, other than that, imo, he is not good as a build up midfielder for 90 minutes.
He isn't a type of a player who will slowly build up and play against parked buses.
I see him as more useful in 442 as a right winger where he can run up and down more than as Barca's/Xavi's type of holding midfielder with 100 smart passes and good movement off the ball all the time.
Still, he offers more than Rakitic currently.
But that doesn't mean that our current midfielders are good.
It just means that some guys have slightly less horrible flaws than other guys.
From current players, Iniesta and Rafinha are closer to our type of midfielders. And Alena could turn into one.
Roberto is one "strange" type of running, hardworking and passionate (but not as good in build up) midfielder.