league is so unbalanced.

I've just played a game, that went as many others, where the enemy team had 2 bruisers (garen and olaf, 1 tank (maokai) 1 mage (ryze) and one support (soraka). I was rengar, an assassin, and I could not do anything because this game is so unbalanced. Those bruisers dont take dmg, 1 shot everyone and are resistant to cc. this mage has tankiness built into all his items, making him unkillable while all he has to do is press e q and i lose all my hp, and then he has almost no cooldown so he does it again and i die. Then theres maokai, a tank who takes no dmg, heals every few secs for half his hp, has 3 cc abilities and does a ton of damage over the span of his cc, meaning i can't escape any of it. And finally theres soraka, a support thats not a tank, means it's an easy target right? well no, all she does is e herself and i cant 1 shot her, if she has no e she has barrier and ultimate, if she has nothing, I still cant 1 shot her because support items have so much hp on them that my combo doesnt kill her and she just q me to get a ton of movespeed and runs away. it should literally be illegal to play champions like those, theres nothing we can do vs that. and on top of that theres the mountain dragons that make them even more resistant. Even a fed vayne could not handle any of them.