The only issue I have with faucets is that the dust produced really only contributes to increased tx sizes and increased tx costs, you hardly earn anything remotely usable so it's really rather useless from a financial perspective. That being said, it's a good way of introducing people to Bitcoin so they understand the basic premises of Bitcoin movement between parties. Personally though, I'd like to think that Bitcoin advances to a point where faucets are no longer necessary - much like how you don't give people money because they don't understand how it works.