I hadn't seen before today the Master of Laws Guide which assembles in a single site comparative information for foreign graduate students contemplating the choice of schools where to study.
Back in the last century, when I had to face the same question, one was reduced to talking to law school teachers and colleagues about what they knew of a particular school. The amount of sheer misinformation that this generated was extraordinary. A law school's reputation (for good or ill) lingers long after any facts may have changed.
My own advice (when asked by students) is to pick people not places. While school reputation is important, even more so are the professors who'll be teaching you. So do a solid literature review in your chosen area of interest and to think hard about which professors are doing the most innovative and stimulating thinking and writing. The tools to do this are getting better and better. And yes, I would be influenced by which schools had the most active blogs and web presences.
Do our friends at Lawiscool have any other sites they use for considering the question?