The Gunners have made a wretched start to the season and lie 15th in the Barclays Premier League, piling the pressure on manager Arsene Wenger, who had already gone six years without winning a trophy.
Wilshere said: "We do get a harder time from the critics than most teams but we haven't won anything for six years and that's not good enough for Arsenal.
"It is harsh, though, especially on the boss.
"He has been there for 15 years and been great for Arsenal. The criticism Arsene gets is just a joke."
He added: "We started a bit slowly but we still feel we can finish in the top four."