Not just that. We can compare to other MOBAs, like Dota2. I'm not saying one or other is better, but more balanced, and LoL is.
On Dota, you always have that super-hyper-carry that can, in fact, 1v5 the other team. On LoL you will NEVER be able to do that, you need more teamwork. This is what balance does too, and that's why I like to play this game.
Hypercarries are balanced in dota.