I agree with everyone here - It's a good taster article but isn't very comprehensive for such a large and varied scene - that said though, I don't think it was meant to be.. I myself have only been dancing Tango for just under a year and there's a lot of info available on the web but it's hard to find any direct comparison or reviews of teachers/clubs/venues..
Thanks Rita M for letting me know about TangoFolly! (http://www.tangofolly.co.uk) - I've read a few of the articles and it seems they have a good overview of the Tango scene and info that I wasn't aware of.. I'm definitely going to try out some of the other venues etc..