He's doing well right now, to be fair to him. At least for Man United. He deserves credit and he does have a good degree of talent.
But I still maintain that - while he's a quality player in some ways - he's a level or two below world-class.
He's a weird player in that he can produce great moments with his (erratic) passing, and his set-pieces have greatly improved this season. He works hard too (though sometimes it's working silly, rather than smart, as he leaves gaps in midfield).. But he has weaknesses as well - he cannot dribble, his short passing game can be erratic, he's not great in tight spaces or on the half turn, he plays in moments rather than controlling games, he gives away some stupid passes that end up in counter-attacks for the opponent. But there's no doubt that as a moments player, and when he does get his passing range correct, he can be devastating.
I maintain that he's able to rack up G/A and look so prominent for United because everything goes through him and they don't have many other good or creative players. He's at the centre of everything so able to do his 'hero ball' act like a lesser Gerrard. People say 'imagine his stats if he played in prime Man City' - but football does not work that way. In Fernandes's case the reason he's able to produce such stats is BECAUSE he's playing in a team that indulges his every whim. At prime City he'd be just another player and not everything would go through him, and his G/A assist stats would take a massive hit. I think he might be a better player though because Pep would teach him to play with discipline.
I still think he is a good example of a player getting too much credit due to worship of stats though. Good player, on his day very good, but has some flaws which prevent him from being a true world-class player. For example his stats piss on the two City Silvas, but those two have/had a more qualitative impact on the game (David is retired and Bernardo has been poor for a while) simply by keeping the game ticking and flowing throughout the 90 minutes by doing what I call 'great footballer' things i.e. passing well, dribbling to create space, running the game. Stuff that isn't really that easy to track by stats, and certainly not by G/A.
I think players can be matchwinners without producing great G/A.