How is Emery shaping up at Arsenal?

Tactics

Arsenal v West Ham United - Premier League

Playing from the back

Petr Cech was noted, in the Man City game, for nearly scoring an own-goal. This was in part due to playing from the back, and the implementation of this new style which he is finding difficult to master.

However, Cech made another error in the Cardiff game, and the defenders generally have also not fully adapted yet. The goal from Iwobi vs. Chelsea was from several passes, and all emanating from Cech, so it shows that the new style is paying some dividends. Nonetheless, it needs perfecting and this will take time to fully institute.

Pressing

The addition of Guendouzi has helped midfield pressing, and Xhaka and Ramsey have been very adept in this capacity. This was perhaps most evident vs. West Ham, and has progressed since then.

Alexandre Lacazette, who scored the winner at Cardiff City, stated lately that the team is eagerly adapting to Emery's style.