#3 Good defensive work-rate
Though Arsenal had an extra man advantage, they appeared to be the inferior side. Watford hit the woodwork twice and we can say that Arsenal were lucky to get three points. But the changed observed from the Wenger era was that all 11 players were willing to take on defensive duties. When needed, players were also willing to throw themselves onto the ground to block a shot. Maitland-Niles was, in particular, was spectacular and he seemed to be giving quite a good option to Emery even if Bellerin returns.
Although the win was a tough win, it is such games which play an important role in a team’s ambition to get into the top four. A team cannot always win by playing beautifully. Though his tactics are questionable at times, the work rate under Emery is a sure shot hit among the fans.