The banter years encapsulates it really. It is remarkable how literally everything the club has tried in the last decade has gone awry.
Managers - None of them lived up to what we hoped they would become, which in itself was not a very high bar that was held for any of them bar Jose
Upper management - Woody the Arnold. Self explanatory
Signings - Though people may speak in hindsight, we signed a lot of players who were genuinely exciting at other clubs and we had good reason to hope for good things here. And then there are the inexplicable ones who ended up being even worse than we thought they could be
Youth players - To be fair we've done alright in this regard, but it's hard to look past the most talented youth player we've had in years throwing it all away, and the second most talented one in years being unable to find any kind of consistency
All of this done while spending ridiculous amounts of money. Purely on the basis of numbers, you would have expected something to have turned out good by sheer luck. Even during their barren years, Arsenal had players like RVP, Ozil, Sanchez as some of the best players in the league, giving them something.