OK, they must be coming directly to PES6 after playing PES5. I have been playing PES5, Fifa 2007 and now PES6.
So, this proves the theory. You should adjust yourself to one game and then compare it to the real football in order to adapt to it.[of course, only if you get adapted to this game]. I think if you did play PES5 and then PES6 directly, you wouldn't face such a feeling (I didn't use the word "problem", because I find no problem).
Fifa 07 is by far the better game when it comes to gameplay speed and the animations when the players run, jog and sprint with the ball are also far superior. Its a shame that Fifa 07 very bad in all other departments such as shooting and passing.
PES gameplay is far mor superior than Fifa gameplay, generally. Pay your attention to the palyers height and body shape in PES6 and Fifa07 and you'll notice the difference. I even hear a bloke who usually says that the palyers in Fifa07 look like apes.......