I hate playing against premades.
It is an absolute gamble whether your premade is better or worse than the enemy premade, and here's the thing: it's no fun either way.
When they are better, sure you get a free win, but you have zero input. You might as well have AFK farmed all game. When they are worse, you get a free loss where you are helpess and get 3 man invaded, counterganked, while your lanes get destroyed.
I see nothing positive for a solo player.