Ranking systems should always be taken with a grain of salt.
Here is a solid article on "How Stuff Works" that might shed a little light on the positives and negatives of rankings: HowStuffWorks "How College Rankings Work"
Honestly, when it comes to choosing a school, the best way to go about it is to simply form your own opinion. Check out the school's website, visit the campus, call the Admissions Office and ask questions, get in contact with alums or current students, etc. We can tell you all day long about the different ranking systems that we believe best list the schools and everyone would have different answers and opinions.
It's hard to ask someone's opinion on a school because you will ALWAYS get mixed reviews no matter what institution you are asking about, as you can see from all of the previous posts to this thread. I'm sure there are people who went to Harvard that would argue that they hated their experience and it's not worth it, etc.
Bottom line: the best sources of information are those who have attended UGA and can give you their first hand experience. Anybody can make up an opinion about a school on the Internet. I''d try speaking to actual students and alums for an accurate idea of what UGA is like outside of the basic information that the admissions office can provide.