A.I seem incapable of making the most basic decisions, and usually the wrong one.
On those grounds I would have to agree, the ability to micromanage tactics similar to football manager is brilliant and theoretically should allow for all sorts of variants on play. But unfortunately PES seemed to have left out the AI. players when they should be bombing forward don't, they are often on top of each other, passing seems pot luck if it falls to the guy you want. Defending is a joke if the opposition decide to use the wings as every god dam player seems to get drawn to the ball leaving massive gaps. If this was school kids playing football then perhaps I could believe what I'm seeing, but come on its a joke.
The game has moments of brilliance, there is nothing better than scoring a goal but if your playing with a mate he will be cursing the game for its mentally retarded A.I defenders.