Coutinho is easily top3 flops of barca history i think. Honestly, i also thought he will be good here.
Based on money paid, yes.
Based on a lot of money, hopes and performances:
Chyngrynskiy, Alfonso Perez, Geovani Deiberson, Quaresma, Dembele, Riquelme, Bonano, Dutruel, Rustu, Litmanen, Ronald De Boer..
Tons of players since stats wise only 1 out of 3 signings play decently for Barca.