I don't see what Arsenal fans expect from Nasri. He left, yes, but I'm pretty sure they were chanting "Nasri you're a ****!" before he even left. I'm that lays the foundations for a nice return. He's been insulted at every turn by the fans, he was booed everytime he touched the ball yesterday.
Either way, he was only at Arsenal for 3 years, fans are always saying he only provided 3 good months, you got a nice stack of cash when he left. He might not win anything but he's in a better position than with the club he left, and he's getting an extra £90k p/w for doing so. Both sides should just leave it.