People hate Osman mate just because he is an easy target and going rusty.
I seen mirallas make some shocking passes against Norwich and people ignore that and pick it up when Osman does something ridiculous.
Yes, it is stupid playing him CM as he is not strong. If he is playing I would play him in a more advanced role
Not comparing them in terms of ability, but Xavi and Iniesta aren't strong either yet do great things in central midfield. I hear what you say about some players seeming to have freedom to mess up whilst others get jumped on very quickly.