Brighton were very impressive during the first 45 minutes, not anything like a team close to the relegation zone, they've been compact without the ball and pressed well. Going forward they have managed to create a couple of chances, disappointing not to have scored yet.
Arsenal haven't showed any of the desire they displayed against Chelsea, and they would need big changes in mentality and probably personnel to get back into the game.

I have been following Sheffield from last season and their performance this season has been quite abysmal when compared with last season. I assume their last season form is what is still keeping Chris Wilder in charge, but at some point they would need to bring in a new approach if this current form continues.