I don't know either, I thought you hadn't noticed his style.
As for the discussion, I've posted in other threads that I believe people ignore the mistakes Hummels makes too easily, while being very critical about Bonucci. Confirms what I think.
Sort of reminds me of people fawning over Kjær at every opportunity and ignoring clear flaws. Although obviously Hummels is far better than he has ever been.
Edit: I don't know if it sounds like I don't rate Hummels, but I do. He's in a similar position to Bonucci last year. He's still young for a centre back and can develop into a very good player.