Most of Nasri's assists came in one game ( also coincedently his debut) he's been average at best and just disappears in games too long for my liking......
Stats are like mini skirts; they reveal a lot of things, but hide the most important parts.
One of the many reasons i like to watch players myself before giving an opinion of them, Xavi is a fine example of a player where stats really dont show how good you are.