I think Arsenal have taken the view that it's difficult to open up teams, so they'd rather use set pieces to do it, which is fair enough. It's not pretty but I doubt anyone would truly care.
While they look very strong, this is really nothing new, it's towards the end of the season when the real tests will come. I think they need to try and open up a 10-12 point gap between now and the end of the year, that will give them a decent buffer when they have their characteristic wobble.
Their squad depth is great though and I think that will potentially see them over the line... Arteta is never going to have a better chance than this. Liverpool have fallen off a cliff, Man City still look hit and miss... and there's really nobody else to worry them. Well, aside from Man Utd's epic resurgence...