Generally, pretty much all ranking systems emphasizes WIN/LOSS upon individual scores. All the ranking systems I encountered did this in the same way (Lol, CS:GO, Survarium to mention a few). That’s rather logical. You can be the top player of your team or even from the server, but if you don’t play the objective, support your team (put together, CARRY YOUR TEAM) your game is basically meaningless. There’s no reason a lonewolf sniper randomly picking heads who does not give a dare about his team and let it lose can possibly benefit from being the top player on the scoreboard sheet. I hope this sounds pretty clear for an explanation.
Now, if you want to maximize your chances of winning, as the matchmaking system is set right now, you better play matchmaking games with friends. 1 friend is already highering your chances of winning by a good margin. But having 4 is still the best way to do :p. The matchmaking still don’t put N players parties against each other, keep that in mind. So, if you go alone, you can end up with terrible walls of vets going bezerk mowing down mm players. Since the open beta release (02/06/15), I did quite a few matchmaking evenings with friends, and I never encountered other 3/4/5 players parties against us. Just to tell you how bad it is. So, as an advice, better get friends to play with you, or wait for a proper soloqueue system.