balancing

i used to enjoy playing lol with my friends and with randoms back in the day was a fantastic game but now its trash the champs in this game ARE NOT BALANCED for example if olof gets 2 kills the game is already over same thing go's for zed,kat, rengar, kazix i can go on but i wont i just miss having to rely on actual skill instead of these op champs that riot thinks is balanced i just miss my game