So why has'nt Arsene Wenger been sacked as his Club have underperformed for over 5 seasons now and David Moyes has been trophyless for even longer, so underperformers are not always sacked are they...
Who said that challenging for the title and finishing in the top 4 every season was a sign of failure? Arsenal play what can at times be called "beautiful" football - Wenger won't get sacked until the club falls apart. Who sets the standard that one must win silverware at a mid-table club or get the sack?
Try to look at the circumstances in which these 2 managers operate before suggesting they perform worse than a group of people who brought no one new to the first team in a decade despite being hired for the express purpose of bringing in young players.