Some players come in and dont do a lot in their chances and still get more. Fellaini did play well individually this season, but in previous times he was given chances without doing a lot and still got more. Miki has had to do more than most to get more chances.
Might I ask you to be more specific, when is that "previous times"?
Schneiderlin last season (29 apps, 72.4% full game, 13.8% subbed off and 13.8% subbed on) was clearly played more league game time than Fellaini last season (18 apps, 33.3% full game, 33.3% subbed off, 33.3% subbed on).
Fellaini got more game time in FA cup competition last season because he contributed a lot in a cup competition.
Fellaini in LVG first season did very well and as a result a lot of people didn't want him to be sold after that.
Both players were given their chances by the manager, Fellaini took them, and Schneiderlin didn't. Fair enough that Fellaini isn't United quality player but as far what I have seen since last season that Schneiderlin has done nothing but worse than Fellaini. Just like Fellaini, Schneiderlin is not a United quality player. A lot of people were being deluded by his one or two seasons performance with a mid table club and think he will be a class player at a higher level of club like Manchester United.