Proceed with Caution!
Few topics in education are as controversial as college and university rankings.
There are as many ranking methods as ranking sources. Different sources have different goals – some are academic and others focus on campus social life, school location or some aspect of the curriculum. There is a significant community of doubters who think that the data does not really reflect quality and that schools can fudge the data for a higher rating. It is very difficult to compare across rankings.
Here are some articles that discuss the controversy in ranking schemes and lists.