Sunderland fan here.
First off I just wanna take my hat off to those who aren't moaning about our tactics

Had we played an open style of football we would have been spanked.
From an Arsenal perspective I wouldn't worry, Cazorla looked great when he had the ball, and what surprised me was how well Gervinho (sp?) played, heart in mouth when ever he made a run. You won't come across other teams that can shut you out for nearly (I say nearly, as you cut us open once, when Giroud missed) the whole game.
Good luck for the season