The only way that win over Sunderland could've been better was if that penalty didn't happen. About that penalty, I'm not gonna go on a 'BS trip' about how it wasn't a penalty, it is what it is. That being said, I don't know why, but every time I see the replay of it, the more I'm convinced that it's not as clear cut as it appeared at first.
As for why everyone was interested in this match, Mesut Ozil's debut, I liked how he performed(especially after it emerged that Cazorla's gonna miss the next couple games, we'll need that). I was smiling from ear to ear after 11 minutes, cause that's all it took for him to start paying back that 42.5 million pounds Arsenal spent on him. That pass was so good, I've kept saying it was orgasmic(sorry if that's crossing the line, but that's the first word that I thought of to describe it). Giroud getting his 4th in 4 games(1st EPL goal scored outside of London) off of Ozil's pass just added to the joy, he's proving that Arsenal can trust him. You could probably tell that when he went down towards the end of the game, a ton of air was sucked out of Gooners everywhere, luckily, he's stated that he's okay. As for the other goal scorer, Aaron Ramsey, I think everyone has said it best, this game was all about Ozil's debut, but Ramsey stole the show, and it's not surprising considering how amazing Rambo's been this year so far.
Also there's just something about hunches and Wenger that seems to pay off. For example, back in the 2002-03 season, Wenger stated that he felt his team could go unbeaten for a whole season, the next season, the Invincibles emerged. Last year, Wenger said that once Ramsey starts scoring, he won't stop, this season so far, Aaron is joint top scorer with Giroud.
One more thing, Arsenal's top of the table(at least until Liverpool play) after 4 games, and that's pretty amazing considering 3 games ago everyone were screaming for Wenger's head after an embarrassing 3-1 loss to Aston Villa to start the season.