100% agree. I have to choose between Professional for 80+ rated squads and Legendary for <80 rated squads.
It feels like I'm playing the same squad over and over again. The CPU gets possession, keep possession, shoots. It's impossible to win a tackle. They are 90s Italy defense. Someone they can cut off my angles when I dribble side to side while also closing the distance and tackling the player with the ball. Their tackling is perfect. Even when they do miss a tackle, they recover so fast. I wish they would commit more fouls.
The hardest part of going from Professional to World Class is definitely the drop in teammate AI. On professional I can count on my teammates to make intelligent runs on their own. On World class, I have to micromanage every run; not just trigger the run with "L1," but also flick the right stick in the correct direction or my ST will run directly into the CB's back. It's ridiculous.
Instead of "authentic" and "competitive" game modes, they should have made it "casual" and "sweat." Some of us don't have aspirations of becoming pro gamers.