Many City fans hate Kolarov because he's frequently out-of-position on defense and 1-on-1 he's an average defender.
For me, I love Kolarov. His crosses are phenomenal - his corners are very good, and while defense isn't his strong-point, so long as he's not a zillion miles up the pitch, his defense is OK.
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Our side at present, wins if we outscore the opponents. Defense is secondary.
Kolarov fits into this scheme very well.
IMO, it's up to the holding midfielder and the rest of the defense to cover for Kolarov once he ventures forward.