I wouldn't disagree with that. He undoubtedly was some talent. Was starting to do okay with Marseille and in the end up they could not wait to get shot of him. At Nice he seemed to settle score goals, some of his performances were brilliant, and then he went missing again. Earlier at Liverpool and his second spell at AC Milan he hardly kicked a ball.
I remember when he was with Inter Milan and I thought he was the next big thing, and then Mourinho made a few comments about him being hard work.
The guy definitely has issues with football, people and life in general.