Have been buying at least 10 scouts (lvl 4 - 5) and all of them improved to be quite good if not of my best players. Rate: 7-8-8-7-8.. Get rate 9 and MoM as well.

If you get a rate 5 or 6, then your using/playing them wrong or apply bad formations, tactics, arrows etc.... Buying scouts (6*) doesn't guarantee you any sucess, especially if you don't have the knowledge or know how things and sh*t work in football... Just look at PSG,Man C,Anzi or Monaco in which money can't always buy success