As I remember when I was in lower leagues , I used to find on the auction many players from countries that have a low ranking according to FIFA monthly report such as India , Ethiopia, Bangladesh ...
Now I am in level 29 which is approximately in the middle of each server's levels. I barely see players from such countries ...
According to my observation and experience, I started to learn that the nationality is a factor that plays a role in the overall game result ( otherwise why is it displayed) ?
What you should also keep in my mind is : Not all football players of the top 20 countries in real soccer life are legends or effective...
Example : Almost every teen in Brazil ( which has a population of around 175 million ) plays soccer ...but only a few 5 maybe % only become professionals
and out of the 5 % only 0.5 % become known and 0.1 become famous and fewer become legends
How is that related to TOP 11 according to my opinion ?
When you see a player ... check his nationality first .... and keep an eye of the monthly FIFA rankings ...
If you chose a German player for example ... it is not necessary that he would perform amazingly ... because Germany is home to around 80 million
and not every German player is effective as Franz Bekenbauer or Lothar Matheus or Jurgen Klinsmann were ....
So if you buy an Argentinian AMR or striker don't expect them to perform as Messi or Batistuta or Huguyen do
Here we talk about what is called " Hidden" abilities ...
Time , ratings of the player, the way you see he performs on 2D will tell you if he is good or not ...
usually 10 games are more than enough to give you an idea about his hidden abilities...
But don't forget that your way of training, the formation,, his moral , your other players ( chemistry and combination ) , your tactics, all are factors that help each player in your team to UNLOCK his hidden abilities ....
You will definitely learn how to decode the secrets of this game slowly and steadily as you improve and go in higher and higher leagues...
If you want success and fame , you must spend time to analyze , decode and decipher TOP 11 program cause everything is mathematically ( has a value based on numbers ) based
Good luck