Regarding his words: I honestly don't know why I'm still surprised when he does/says things like this, and I still don't know how I feel about it. The way he instantly reaches for his bag of obscenities seems a bit childish, but he does more often than not get his point across.
I have to wonder if he uses such language so often because he knows tech news is going to report on it when they might not if he were to gently rebuke a kernel dev? It should be noted that after his rant at Nvidia (http://www.theverge.com/2012/6/17/3092829/linus-torvalds-fuc...), Nvidia driver support became a hotly discussed topic and very soon became significantly better. In that regard, Linus seems to get things done and for that, I commend him.
On the other hand, he tends to curse and complain a lot on his g+. It's fairly likely that's just all him.