Mole are you serious? If you are you basically haven't watched enough of him man. Argentine Arshavin? Possibly, if you mean a great player who went to a new club and didn't perform that well I might agree.
In Palermo, Pastore for me was one of the best midfielders in Europe during two seasons. I saw fair few games of him both for Palermo and whenever he got to play for Argentina and was a player who made a difference every single time. If he can get back into that he will be very important today and for the future of PSG. I do think Tooj has a point when he says that maybe he needs a team built around him in the same way many other class players need it.
As for Messi or no Messi, I think Barcelona is the best team in the world in any case. I just get this feeling that Adriano will struggle heavily against Lucas, Lavezzi, Pastore and Ibra.