We don't need him, he needs to be in a team where the midfield is buzzing and creating chances aplenty.
Our play is so stagnant under Moyes, this coupled with the fact that our defence is terrible essentially renders Fellaini's job as an anchorman completley useless.
He'll break up play great and make a simple pass, before somebody in the attack loses it, allowing the other team to break and open up our awful defence, and thus scoring.
He will never suit our play unless he has quick, incisive midfielders running around him and a confident defence; the complete opposite of Rodwell essentially, who is a bumbling idiot on the ball.
It's not like we have a "we'll score more than you" ethos with a 25 a season striker doing the business, he's a defensive mid who we will concede and score with or without.