I am actually of the (admittedly minority) opinion he did alright against city, in the sense of his movement was good and he was very involved for most of it. Had he scored I think it would have been labelled a very good performance. However, he didn't, missed one shocker in particular, and he faded second half before being brought off, so I can accept the criticism of his performance.
I would agree with Scoreboard that he tends to do better with a strike partner, though also with Pogue that his efforts up front on his own get are unfairly lambasted as a whole. Though I would include Bursa away as a poor performance.
Besides Bursa and the FA Cup semi, I recall Everton (a), city (a), Fulham (h), Valencia (a) and Marseille (a) where he was the 1 in a 4-5-1 this season, and he was brilliant against Everton, good against Fulham, good against city, decent against Valencia and alright against Marseille.
Against Brum away we played a 4-3-3 with Rooney wide and Berba up top iirc, and he was excellent.