Tokyo is my favorite. So clean, I would literally eat off the subway or platform. Brightly lit, signs in English and Japanese. Punctual. Signs tell you not only when the next few trains are expected but also where in the system they are.

I've learned to accept Chicago's El. Usually it works, but it's overcrowded, constantly under construction to patch up holes in the 120-year-old infrastructure. Many of the elevated stations leak in the rain and have water pooling on the wooden floors. The last couple years of concentrated construction have really helped, but the system has a ways to go. They've also joined the 20th century and put up electronic signs (with ads, natch) that every now and then will tell you when the next train is coming.