A team is only as good as its weakest link.
How I hate how this is true. It doesn't matter if you're the best player on your team, if your team has the worse player, you will lose. Now look at it this way, there 4 chances of your team getting the worse player out of 10 players if you're not the worse and 5 chances of the enemy team getting the worse. This means out of 9 games, even if you're the best player every single game, 4 of them is pretty much uncarriable and the only way you can carry those game is to have another person on the enemy team just as bad as your useless teammate.
Losing is fun, but climbing isn't fun either.