The former Red Devils midfielder had expected to see more of a contribution from the former Everton man, especially given the Belgian's £27 million transfer fee
Fellaini moved to Old Trafford for £27 million on transfer deadline day and has been criticised for his performances at times, particularly earlier in the campaign.
The Belgian midfielder has not yet scored for David Moyes's side and also missed two months of the season with a wrist injury, and Scholes has been disappointed with his impact so far.
"He's not been great, has he? You have to admit that," the recently retired United hero said on Sky Sports in the build-up to the Manchester derby.
"He did have problems with his wrist and I know he missed a lot of games but, for the money they paid for him, I'd be expecting a lot more, to be honest with you.
"I'd be expecting a few goals, at least. For a central midfielder at Manchester United for £27m, I'm expecting a few goals."