I like him.
Hes decisions some times is terrible and he do make mistakes, but he is a great weapon and gives us an extra weapon going forward.
We just need to create more one on one situations for him. One on one he is imposible to deal with.
I admit he can be fustrating, but we have to remember that skillfull players often are fustrating - even Messi! In a typical Barca match he tends to loose the Ball like 35 times before bagging a brace. I know Costa Will never reach that level, just saying its the sacrifice we have to make if we want wingers with skills.
Imagine Pjaca (When fit) and Costa beeing subbed in at 65 min - not fun for s tired fullback to face theese two!