I don't understand some of these twisted arguments to be fair. By no means did Ander excel today, I like him a lot but even I'm not deluded enough to state that but -
1a) If Herrera has a relatively decent or weak game in an overall poor performance by the team he's called out for it by some and slammed regardless without any excuses being made for his person in terms of acclimatizing to an new league, lack of support from the other players, injury etc etc.
1b) If Fellaini has a relatively decent or weak game in an overall poor performance by the team, a lot of times (NOTE : not always incase someone jumps up in defense) he's cleared of blame which is then equitably distributed among 10 others (or everyone's favorite go-to excuse Moyes for last season's atrocious displays) by the very people who're criticizing Herrera.
Seems like a deliberate self-serving shifting of goalposts to validate one's opinions. Oh well, guess there no way around it.