DC metro really is pretty good. Toronto's public transit system is nice too.
I was talking to someone that's not from around here, and one thing they kept mentioning was how clean the DC metro was - they're like "wow! It's not dirty!" - I guess it's just 'cause we're used to it, but yeah, it is pretty nice. 'Cause they'll arrest your sorry ass if you drink or eat there.
No joke - a 5 year old girl got arrested earlier this year for drinking on the Metro. I think the public outcry was pretty strong, but hey... bet she never does that again.