Actually with all respects I disagree


If you look at general discussion, there are a lot of teams that has 6 - 7 star players failing to win against 3-4 star teams. So strength / quality is one key, but there are other factors like tactics, morale, training bonus, posession bonus during matches and also player form in game, that affects your chance of winning.


I've had some cases which my team with better quality losing badly in the 1st half because of wrong tactics, but almost turned the game around in the 2nd after I changed my approach.


So in the past, quality might be the only key to win (the main reason of bidding war in auctions, duh!), but now, underdogs can do wonders.