I love the CM(A) role.
With the right stats and spaces to attack in your system they can score 20+ goals while contributing defensively with plenty of tackles and interceptions.
For me the absolute key stat is aggression, they have to have the desire to fight their way in to goal scoring positions in the usually congested centre areas of the pitch then get back and get stuck in when the opposition have the ball.
I have a new gen with good stats otherwise ( ant, wor, det, otb, acc, fir, agi, fin, cmp, tec, dec ) but with an aggression of 6 and he misfires badly in the role compar