Right, on Pro it plays realistic, as in real games where you see mistakes in passing, shooting, dribbling, and tackling. On the higher levels it plays superhuman and practically mistake-free. Those are the boost cheats kicking in.
Well, realism is subjective and highly dependable on skill level. Someone who is better at defending will be able to create more mistakes from the CPU for example. You say you struggle scoring a goal a game on Pro; I score 3-4 easily against the best teams - that's unrealistic.
I've read elsewhere some people recommending playing on Legendary over WC, that, as counter-intuitive as it may seem, it plays out better. Anyways, my point is that I've been testing this, playing on Legendary, and I've had no problem forcing the CPU into making mistakes at times. So the idea that the CPU plays superhuman and practically mistake-free is not true for me. (Which isn't the same as saying I'm not getting crushed.)
On the other hand, Pro is not realistic for me because I can play against the best teams in the world and force them into making mistakes like they're lower rated players.
To each's own but personally I like to play on a level that I see the fewest dumb mistakes by the CPU, which on Pro there's too many for my tastes (or maybe ability level, whatever), and then use sliders to deal with physical and other boost.
IMO, all of us are always going to be smarter than what the AI is capable of, which is
our unfair advantage over the CPU. That intelligence gap is just too much for my tastes on Pro.
But to each's own. That's why all the different settings options and sliders are wonderful in FIFA - because it's amazing how much variance there is in all our preferences, interpretations, and ability levels.