Assuming you mean players not playing to the level they were capable of rather than not playing to a level they were previously capable of, then no. If you look back at City's squad from 2015/16 it was full of players well past their best - Hart, Kompany, Zabaletta, Kolarov, Clichy, Toure, Fernando, Nasri, Bony etc. Of the rest of their squad I'm not sure you could argue any of them under performed - Aguero had an excellent season and while Fernandinho, KDB & Sterling didn't play to the level they have this season, they never played to that level before either and by their standards at the time, had decent seasons. It's been under Pep that they've reached the level they're currently playing at. If you were being really harsh you could point the finger at Silva for under performing but that's about it really.Or City under-performed?