Why?
I just don't get it.
I play someone like GP, and have ~100k mastery points on him, but have my ass handed to me despite doing everything in my power to win. I pick LB or Kat, both of whom I have never played more than once, and absolutely dominate. I play an easy ADC like Sivir or Jhin, and I just stomp people with automatically aimed attacks. I play Graves or Ez, who have real counterplay and skillshots, and just have my ass handed to me half the time.
Why?
Why are easier champions just so much stronger than more complex champions, and why can I win EASILY with a champion I've never played when I have trouble with a champion I've played hundreds of times?
I don't get how this is balance in any way.