Just to put some people right. Reading had a good season because they played attacking football, it was not expected by many teams players and they did well. This season people have wised up to it.
It happens mostly to smaller teams, but if I am managing AC Milan, who are unstoppable in one season, they should not suddenly become utter crap in season 2.
Just like most of the time big teams play the same tactics that worked because, simply put their players are good enough to outweigh any tactical alterations the opponents make.
Again another example of the game not taking into account realism.