This is a great introduction to UnMet, providing an interesting location on the fringes of society with encounters for your party. It's a good example of a 'vanilla' adventure location and opposition made interesting. I found it a useful jumping off point for my own ideas and a guide to getting started writing my own stuff. As an entry point into the underground it could easily lead to other things. At seven written pages this is also the perfect length for the GM-on-the-go to pick up and run.
I gave this a rating of four out of five because I felt the Waterloo Underground station could have been detailed a bit more - one or two memorable NPCs could have really raised this up. A map would also have been really useful. Ultimately though, there's enough here to provide a great short scenario and inspire you to build it into more if you want to.
Given that there's also nice new stunts and qualities for underground fighting and Dhampyr characters, this is a great little supplement.