I think it's more of a formation/personnel change than anything else. Before last season, he was pretty good, mainly because play flowed through him - he was involved, pulling the strings and even going ahead and scoring. Last season, with CR7 in the squad, play wasn't flowing through him, since Ronaldo likes the ball more often. They tried to use him as a facilitator to Ronaldo, but that didn't work out so well for them, and he was benched for long periods of time.
He is more of a trequarista in that regard, than a clinical finisher. Play has to flow through him for him to be very effective. In that sense, I think he can be pretty successful here, even in a 4-3-3 or a 4-2-3-1.