Lyon France .. nice but only French signs
London .. my FAVORITE in the world tho lots of walking
NYC .. filthy, scary, not a place I want to be
Chicago .. decent but some routes are a bit scary
Minneapolis has a Light Rail (not true subway) that is very nice clean and fast. AND it goes from the MSP airport to MOA (Mall of America!)
Dallas also has a Light Rail .. have not used it since it opened as I was departing my secondment in DFW.
Amsterdam Tram system is fabulous