For me he is another Robinho and I wouldn't touch him with a barge pole. Lots of tricks, and no real intelligence. Actually, don't want to rude or anything, but he doesn't look to have much IQ at all. Not that football players are famous for that, but it seems that teams, who win at least something, have players who can think on the pitch. And for Neymar, apart from raw talent there isn't a lot. He would lose morality against tougher opponents and would become useless.
For left wing I rather have Juan Mata and for SS I'd take Pastore, would be 10 times better + proven in SerieA.