First off, people need to understand that Alexa's numercial ranking system is DEPENDENT on the number of Alexa toolbars users that visit your website. This should be an underlying understanding each time you view a website to gauge its traffic levels. If you ignore this, then your impression of a website can be incorrect. This is a very common mistake that people make, and ultimately find out the error in their judgement. Get the facts before you make a decision based on Alexa. Let Alexa guide you to the correct information, and consider its rankings an estimation of traffic levels a website may recieve in any given time period.
From:
http://www.globalpromoter.com/free_s...ls.cfm?tutid=5
So it is a decent consideration of measurement. Anyone that says its retarded or irrelevant is actually an un educated blithering idiot with somthing to hide.