I dont think a win defines a better team, for example; I got backfilled into a classic huttball game the other day on my lvl18 marauder, it was clear that from the start my team had no interest in the actual objectives and upon entering the arena I killed a guy on the enemy team on our line becoming instantly unbeatable. I went on to score 5 goals, (we won 5-0 so you can see what was going on with the rest of the team) got 20 medals, 25k obj points and still managed around 2k dps.
Did I get an mvp vote? fat chance lol, were my team the better side? no, the opponents had better organisation and idea of what to do.
The simple fact is (and I really don't get the opportunity to sound like i'm bragging so please don't take it in such a way) I was the difference because had I not been backfilled into the game then that guy running to the line with the ball would have scored, and the team would have just carried on derping and lost 0-1 or more.
But my thoughts when entering were like, "ok, enemy team is better, but maybe I can outplay them and use my leap offensively and medpacs stims etc and get a few goals", and it was a really fun game, even got a solokill.
So yeah, to the op thread question - You step up n just play!