"It was really, really poor," he told Sky Sports.
"There were six changes and although that's a bit over the top for me, I still think it should have been enough to get a win, never mind a point.
"After 20 minutes I thought it was going nice and easy, but then I started to worry around that period of the game when (Mikel) Arteta and Santi Cazorla slowed it down and a leisurely, horrible slowness crept into their play. All of a sudden they were punished.
"There's nobody left to blame but themselves. For the first goal, (Mathieu) Debuchy pushed in too deep when he didn't need to and (Alex) Oxlade-Chamberlain switched off. The second goal was an absolute shocker in the second half."