I play 4-5-1V down the flanks and my MC's are both. 7*, constantly get 5/6, probably because the way my tactics work means that they don't see much of the ball, all they do is defend the middle.

Well that's my logic anyway.

I think defenders match rating is based on how they defended only.

Midfielders is a mix of both, hence why they only get average ratings due to the fact they only do half of what they need for a good rating.

And STs is attack only.

But like I said, just my logic.