Eh, I made the mistake of taking a data mining course in college. They taught us the "problem of dimensionality," such that given an N-dimensional data set, doing comparison between two points on an N-dimensional space is less and less accurate or meaningful the greater number of N dimensions you have.

So when I hear "based on hundreds of points of criteria" as a marketing ploy for a dating site, I hear increasing rate of error in determining similarity between two data points.

But, you know, I hear they work for other people.