How to reckongnize "the Beast" player?

[QuocBao]

Sometimes we get players that will get very bad rating. The only thing to transform him is to sell him, when he's transferred to another club, his rating may be different.

I transferred to another club and He was still bad

[HULIANO]

I transferred to another club and He was still bad

I bought bad ratings players from other clubs but they perform pretty well at my club. Perhaps it depends on the whole team performance and formations & tactics also.