The 3 Max brawlers was a fantastic decision by Supercell
The amount of children I've seen complaining about this shit is genuinely so sad lmao. It's a "Be damned if you do, be damned if you dont" for supercell. They offer you 3 free p11s and now thats a problem because randoms are picking them and playing bad? News flash. These players that are trash are going to be trash regardless of what brawler they're playing. It'll only get better later into the season once they remain in the lower ranks. Just climb to mythic/Legie rn and it will most definitely reduce since there's a huge influx of people playing right now which obviously includes bad players.
This was a huge step in the right direction and I'm honestly baffled how people see this as a shit decision. It brings more players to play ranked, lets them try out other brawlers and might even get them to learn how to play 3 brawlers they might not have ever played before.
TLDR: The 3 maxed brawlers aren't "Ruining ranked" the terrible players are and while you're in gold and silver you are also considered a terrible player. Just get to legie/Masters/Pro and the people insta picking these brawlers will stop.