The Rant blog. Passionate, mostly rhetorical and cathartic in nature.
The Attack blog: Highly biased, intolerant, rhetoric filled, ad hominem, name calling, childish.
The Thoughtful blog: Introspective, conceding points on merit, non-ideological.
What is most disconcerting thing about the attack blog is the mob mentality that is generated. So they self generate a desire to repress. Some of the comments become rabid with zero tolerance to ideas outside of the group. To read them can evoke such a strong emotion that can override the understanding that nothing is to be gained by jumping into the fray.
He who knows when he can fight and when he can not will be victorious. ~~Sun Tzu
My friend Shoo is very adept at divorcing emotion from discussion, it is a trait I really admire. I tend to wear my heart on my sleeve when it comes to such things. The Wizard does as well, usually making me re-consider a position. Both I consider thoughtful blogs. (my own is a rant)
While I enjoy a good rant, I prefer to read the thoughtful.