That's according to Line of Duty and Bodyguard creator Jed Mercurio, who is also a United fan.
Fernandes has been lauded for his sensational impact at Old Trafford since his £47m arrival from Sporting CP last January.
The 26-year-old Portuguese midfielder has become an instrumental figure in United's starting XI as the Red Devils push for Champions League qualification next season.
Fernandes has made 44 appearances this season and scored an impressive 23 times, as well as registering 13 assists in all competitions.
However, the former Sporting CP star has been criticised for 'disappearing' or 'underperforming' in United's big matches.
Speaking on talkSPORT, Mercurio called out Fernandes for having brilliant "opportunities to play people in and [messing] it up."
The Line of Duty writer and creator explained: "I find him a frustrating player to be your favourite.
"Bruno Fernandes is probably one of the most inconsistent players. There's that saying in golf that there's no commentary on the scorecard.
"You look at Bruno's stats and think, 'This guy must be flawless as a player.'
"Then you watch a game and watch him give away possession and argue about nothing, have really good opportunities to play people in and mess it up.
"You just think, 'Oh, please do it every week.'"
Meanwhile, former Chelsea defender Jason Cundy has branded United "Bruno FC," saying that the Red Devils wouldn't be in the Premier League's top six without him.
Featured Image Credit: PA
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