@noodlehair in my opinion you are exaggerating his weaknesses and undervaluing his strengths there.
Not going to type up a long drawn out post because it has all been said before, but;
For example, where you say that he is "good at heading in crosses", I would say that he adds a whole new angle to our attack, and that we have seen plenty of times in the past that without any genuine aerial threat, teams are happy to just show us down the flanks and defend the central areas, and we cannot break it down regardless of how many crosses we put in. Furthermore, his aerial strength has been a major asset for us on defending set pieces and corners.
You are saying we stopped playing football in order to punt crosses at him - but this is simply not true, and I suspect you probably know that as well and are just saying it for dramatic effect.
You say that there has been several games where he has been the least useful player on the pitch and offered nothing - but I dont think that is true either, as like I said, even when he isnt directly involved, he is an asset on defending set pieces and his aerial presence forces opponents to defend wide areas, which creates space for other players. If anything, I generally apportion more of the blame on those other players, who have
not had opponents specifically man marking them, have
not had the opposition pretty much setting out to stop them, and have still failed to produce anything (I am primarily referring to the three games without scoring).
Your description of his "special role" is also pretty biased as well, as it was this "special role" which was crucial to our success in most of our best periods this season. Where you seem to think it is a problem for us to have a unique player, I see it as a benefit to have that in the squad, and that it gives the manager options that other teams do not have.
His ball control, there isnt much I can really say here except that if Fellaini's ball control is the worst you have ever seen, I would question how many players you have actually seen. If you are interested, skip back through this thread and you will see absolutely loads of comments by posters who are/were pleasantly surprised by his technical ability on the ball.
Basically you are just being massively biased - you say yourself that you are probably being "a bit harsh" and I think the reality is that it is a lot more than "a bit".