3 defenders (W, N) are always good if you hv a nice team with 5,6 star players and on 1 condition, you must attend to watch the match, cos only 1 mistake that causes a red card, your game is ruined.... (if 1 dc is sent off, a formation with 2 dcs seen as illegal formation). And yes, 3 N dcs are good againts team attack through middle, 3 W dcs are good againts formation like 4-5-1 V, 4-5-1 classic, 4-3-2W-1 with 1 ST and amr, aml.