Why did you lose the next round then? no, good job there. I think around 4 a 5 people you have the most chance to win the game. You just have enough ammo for every round and you the change is low you get screwed over, because of other people's mistakes (stupid actions).
But i think that the rounds becomes so difficult because most people play as individual. (me also included regularly). If you play more as a team it will be alot easier.
Yeah, if you don't play with to much people and you don't encounter the 3 bosses without immunity . then i would see a slight possible way to win the game.