This, so much.
I don't want to shit all over FIFA as it is a good game, well 14 is, 15 not so much. But it never made me feel like I was involved in a real match. It was bomb it up the wings, cross, shoot, score. The AI never play football like a proper football team should. There's what seems to be a few scripted moves, a very few at that but the AI play the same way every match. Every match you play on FIFA feels the same there's no ebb or flow to any of it.
As you say, PES feels really natural, it has better pace, the AI actually play proper football. Each game feels different, each player feels different, you can feel your players tiring as the match progresses and you know substitutions are required. I could play a full match of FIFA without subbing anyone.
Your in the final 10 minutes of a match and it's 1-1. The opposition have been very patiently trying to break you down unsuccessfully all the second half. They start pushing men forward, they want those 3 points badly. You feel your under even more pressure and your players are on there last legs and you've used up all your subs but you feel you might get a quick counter to finish the match off if you can just nick the ball off an opponents foot. The pressure mounts as the minutes tick by, your keeper is keeping you in the match with a string of wonderful saves. Then there's a mistake, and you've got the ball, you see your chance, you skin there last defender and your 1 on 1 with the keeper, you look up, see the big gap and you hit a tired shot to the keepers left, he throws himself at it and gets a fingertip to it but it's not enough as the ball trundles off his post and in for a great 2-1 victory.
This is PES
The pitch certainly is ours.