Sanchez is certainly good enough for the Premier League, whether he's suited to it or not it a question that will be answered next season and I think with him being the holding player in a very good Colombian team it's worth us showing patience and finding out before writing him off.
As for his performance at Arsenal, I've seen much worse. I always remember Ehiogu against Norwich, even next to the God himself he still looked like a pissed up pub footballer had snuck on to the pitch.
