It is not the player that could turn this into a bad transfer. It's the clown that is managing us. Griezmann would improve any team, and the great managers always find ways to integrate dynamic, technical, and hard working players like Griezmann.
Griezmann is very versatile. The problem is that Valverde's creativity is almost non existent. He is bound to use him improperly.
Imo, this is a very good transfer. Hard working attacking player with great numbers, just the right age for immediate impact. Unlike Messi and Suarez who are lazy old dudes who can't be arsed to run and defend, Griezmann works his but off on the field. A breath of fresh air.
Griezmann is like Pedro in terms of effort and discipline on the field, but has the game-winning qualities of a superstar on top of that. He offered those qualities at every team he played, be it Sociedad, Atletico or France NT. If he doesn't at Barcelona you know it's the rotten management at fault.