In what way do you want it more realistic? Give a suggestion how you want it for example?
"give me a better game" probably won't be considered "feedback" by KONAMI.
I personally think 2011 is better than 2009 & 10 in that departement, however it is a game and we can discuss how realistic the attributes really are in the first place.
For example, in real life I am quite a good free kicker, but if I focus on free kicks 2-3 hours per day for a week I can still see a very noticeable increase in my ability to clinch them in. If I did the same next week, but focusing on sprinting I would probably not get much faster, but my stamina would certainly increase.
In pes2011 I have noticed that some attributes are easier to get than others, for example free kicks and swerve gets better quite quickly, while pace and acceleration is a lot harder.
At the moment I thereby think the current model works, if you disagree by all means do. But at least work out a rough idea showing how you feel it would be better and why.