Matchmaking isn't perfect

And it probably never will be. Even when the matchmaking attempts to give us the fairest games possible, there are a number of random variables that the system just can't account for.

Banning One tricks Some people have limited champ pools. Their skill level may be tied solely to these particular champions, and if they're banned out, well...

Flame, toxic, tilt You never know what might tick people off. Maybe a player had a bad day, or a bad game. Or perhaps something happened in game, no matter how minor. Either way, we have all encountered individuals who get aggravated to varying degrees of severity due to some factor, which affects their performance.

Fatigue All players have varying degrees of performance, which usually depends on how energized they're feeling. Just woke up and hopping onto a game of league? Finished a long day of work? It's getting near the time one usually sleeps?

There's probably more factors than just these that cause unbalanced matchmaking, but these are the ones I can come up with off the top of my head. However, if you'd like some advice on climbing more easily in this environment, I would have to suggest finding a duo partner you can really count on and trust, or at least playing some warm-up games before heading off into ranked.