The case was a joke for multiple reasons. One is the sheer idiocy of putting hot coffee between your legs and then blaming the coffee 'maker' when a spill causes burns. Coffee will burn you at a temperature far lower than the temperature McDonald's had their coffee, including the temperatures used at other restaurants. The extraordinarily high heat had an impact on the extent of the burns, not necessarily on the woman getting any burns at all. Most people are wise enough to understand this, having burned themselves with coffee or tea they've made at home and learned this lesson at some point in their lives.
Now, using the following article, check out the subsequent mean temperatures being used by restaurants. You'll note that, while it's lower than what McDonald's was using, it's still hot enough to cause burns. That's because people LIKE hot coffee. It's understood that you get very hot coffee, add what you want to it, and then wait until it cools to the temperature you like to drink it at.
http://www.allbusiness.com/sales/customer-service/683924-1.html
Another reason the coffee case was a joke was the ridiculous award won by the woman, most of which was in the form of $2.7 million in punitive damages. The award, in fact, was lowed a great deal, from over $2 million to under $0.5 million. Even people who sided with the old woman on a lot of the case felt the amount awarded was ludicrous. And it was.
P.S. The case was eventually settled for a non-disclosed amount of money.