He was fine for the non-existent service and support he was given. Nimble strikers like him have no say in games where there is no midfield engine and no transition. Basically had nothing to work with and no pull back options from the flank. You could have put Sanchez up top in yesterday's team in his place and the result wouldn't have been much different. Dire is what Ramsey and Jenkinson were.
We will see what Perez is actually made of when he plays with Ozil, Sanchez, Iwobi and perhaps one day Cazorla.