I don't care if it's "just normals." Shitty matchmaking is shitty matchmaking.
Seriously. Completely mismatched games are extremely unfun. Way too often I've had to play against a high diamond player (sometimes even masters players, hell once even a challenger player) in a game that was otherwise full of gold or plat players. Normals should be fun; how much fun do you think I'm having getting killed by a player who's at least two leagues up on me, who then kills both me and my jungler when he comes to gank for me, who then troll rolls the entire game off of 3 kills with absolutely no hope of being stopped?
It's not even like there's a bronze player on the other team to balance out these games either - this often happens where the other players are all in similar tiers. These sorts of games are extremely unfun, and are part of the reason I rarely play the game anymore without a premade (the other being horrible toxicity making playing the game without my team on mute unbearable.)