Aguero's goal last season saved Manchini's job. He has under achieved massively give the resources at his disposal. My granny could manage that City team to second in the PL! They should be leading by 10 pts not playing catch up.
As for the CL, well he has done no better than expected, given his pathetic track record in the competition. For all the money City have, whoever is behind the scenes is doing a very bad job of advising sheik Mansour. Mediocre managers and over paying massively for run of the mill squad players (phillips, milner, rodwell, sinclair, santa cruz , adebayor, toure etc etc etc).