The topic Table of Counter Formations v2.0 - Which formation to use? has three suggestions for countering a 4-4-2:

3N-4-1-2, 4-5-1 V-Style, 3N-2-2-2-1 Butterfly

I've personally had success against the 4-4-2 using a 4-4D-2 (DMC-ML-MR-AMC) in cases where the quality of the other team was within 2-3 points of my own team.