One may say that Xu Ming was very arrogant.
But he could afford to be arrogant - he had both skills and a strong backer.
Although his acting skills were a far cry from old-school artists, if Xu Ming was compared to a group of young idols, his acting skills would be considered pretty good.
For example, the classic bad example, Gong Xu - even though he gained popularity through his stunning looks and abundance of wealth, his acting was too horrible to even watch - he could only show one facial expression from start to finish. He couldn't even remember his lines and only said the numbers 123456 while acting, forcing the dubber to add his lines in manually. Photoshop cutouts, using substitutes, and all kinds of other shady techniques weren't out of the ordinary.
So a young man like Xu Ming who was popular, had a sponsor as his backer and had average acting skills was already considered quite remarkable.