Arsenal show set-piece threat and resilience but what more do they need?

Arsenal had only won two of their previous 11 trips to Old Trafford. An opening-day victory at a stadium where they have so often struggled is something to be celebrated, however unconvincing.

source https://www.skysports.com/football/news/12040/13413599/arsenals-set-piece-threat-and-defensive-resilience-sees-off-man-utd-but-mikel-arteta-knows-they-need-more