The results are utterly ridiculous, when you lose to a team with only 5 players non of which are over 10 in quality, you start to realize that it all means nothing at all, it's all just random, you might as well roll a dice.
You would never play against a team with only 5 players. If a team is short of players, either the game engine will fill the vacant gaps in the team, or you would be awarded the match 3-0.