I didn't see the game, and am glad of it. What a tremendously disappointing result, especially coming against a team that had not previously won a game in the league all season. There simply is no way Arsenal will challenge for silverware, or for a Champion's League place next season, if they cannot mount more consistently strong performances from week to week. On occasion, they have looked as good as any team in the league; on others, they look as mediocre as they ever did last season.
A result like this, against a plainly inferior opponent, suggests a combined failure of motivation and leadership, which may be the chief consequence of losing top performers from one year to the next.