League's greatest fault in terms of gameplay

The simple fact that a worse player has a fat bigger impact on the game compared to a better player.

I've lost the count of the games that simply went to an obscene throw because of 1 guy who either lacked skills (compared to others) or decided to not to play good.

Now, as a teamplay based game is really frustrating that 1 single guy has such impact on the outcome of a match. And it's not even the "good way" of it because lets be honest here:

• If a really good guy can manage to fill team mates hole that is awesome and shuld be rewarded.
• If a single bad guy can make any form of teamplay from other 4 ppl totally useless it's bad design and is infuriating.

Now, I don't know how and why is like that. This is a thing I noticed in my year of playng this game, starting from 0 and reaching an above of silver level. It surely not high, also because I grew up tired of Rankeds but still is enough to undertsand a game.