His "one decent game" was the first one he started in his preferred position and he scored one goal, assisted the other, and created the third one, being the man of the match in that game. If that's only a "decent" performance then I guess no one is up to your standards.
The rest of his "horrible" games have been mainly off the bench or playing out wide on the left despite him preferring the right, where he has registered another screamer (salvaged us a point against Atalanta) and 3 more assists (one salvaged a point against Benevento, one salvaged a point against Crotone) while showing plenty of hustle and guts.
I think his start has been even better than I expected. I never considered him a game changing player let alone someone worth even close to 60m but he has positively surprised me.