Can't get enough of statistics, I really can't. First of all, you have to question them. Don't give in to the allure of your first interpretation. Dig deep and dive in, and keep questioning. Chances are that if someone is using stats to prove an argument then they are using only those stats that help their case. So it follows that other stats will work against their case. Only when you see the full picture will you get a chance to make a reasoned, informed choice. Sounds simple enough but just a quick look in the media (any medium) will show you an example of biased use of stats. Whether by accident or design, it happens every day.
Interesting Wharton article on this topic here.