What formation are you using?

My MCs regularly get 5/6 ratings.

Reason being, I play a 4-5-1V, with the passing focused down the flanks. Therefore my MC's don't get involved much in my attacks and get bad ratings, so I'm not to fussed.

Try a narrow diamond or a 4-3-3 with passing down the centre, and 90% of the time their ratings will increase.