http://www.rpg.net/reviews/archive/13/13928.phtml
Tom Vasel's Summary:
Portobello Market is a game that, if it took over an hour, would become repetitive, boring, and one that quickly would land on my "outgoing" pile of games. But because it's quick, it has a rapid tension level and is simple to teach others - I really enjoy it. It's a good start to a game night, because it has some real meat despite its short length; and although I may be getting tired of the "market" theme, it works well enough here.
Go to the full review for more information.