You've not come up with great arguments. We all know he isn't great defending but how anyone can say he isn't a danger going forward is beyond me.
When he does advance forward and fair play to him he gets in some good positions. However the problem occurs when he thinks these first time crosses (which you do when your 7 to get height on the ball) are good. Most of them connected with a Villarreal player and I believe were generally cop out balls because he is an awful crosser when the ball is dead. Additionally when he commits himself offensively, he then can't commit to his defensive duties which when he does defend as already stated is no better than elementary defending. He doesn't challenge full stop, he made one successful challenge if memory serves me right, he does not jump when challenging for the ball, I don't know if this is due to lack of heading ability but many goals last season were due to him at set pieces defending.
I though Kolarov was superb at B'burn but a free kick scored against B'ham away last year; another against Napoli at home and an assist last night cannot defend (excuse the pun) solely on that. Most of the threatening attacking plays when Kolarov is in the team is on his side. Maybe I over exaggerated that he is simply "SHIT" but when I use that term I apply it similarly to Dzeko as well, so what I 'm trying to say is that he is simply not good enough.