I will make an easy prediction. Welbeck will become a fan favorite at Arsenal. Most of the fans might have wanted Cavani or Falcao instead, but Welbeck is the type of striker that Wenger has breed through over the years he has been at the club. Although, most of them ended up leaving, their accomplishment was not forgetten.
Nevertheless, at the end of all of this, Arsenal fans will be glad they bought him over the more expensive option because most notably, Welbeck will work much harder, he is a team player rather than an individual and he has the drive/ambition to achieve great things. If you have doubt about his goal ratio, you should probably be aware that his goal ratio when played as a striker is good enough for any top team. Looking at how things turned out, I would have been much more content if you guys took back Van Persie, but we can not do anything about the past. He will be a great signing for Arsenal.
Bullshite. It was thanks to him and Rooney/Januzaj amongst few others that we did not finish less than seventh. When he had his spell upfront, he managed to make Moyes win manager of the month, which should be an accomplisment of itself. Welbeck and Kagawa suffered the most in regards to the type of football we played last season.