Which city, do you think, has the best one? I've only been on the underground in London, Glasgow and Munich. And to me, London seems the best, you really don't need a car there (well at least in the centre).
On the other hand this made me realize how good the Berlin system actually is.
[1] actually not always, but with very rare exception.
{EDIT:
I'm getting downvoted so I think I misunderstood what you were saying.
On rereading again I now think you were saying "unusually due to overcrowding the trains were missing out every other station". Previously, I thought you meant "unusually due to overcrowding the trains stopped as frequently as every other station [whereas usually they visit fewer stations than that]".
I was trying to point out that stopping often is usual Underground behavior, thinking that you were assuming it wasn't.
}
There's a very strongly worded sign at Covent Garden station, telling people that it really is faster to wait for a lift. But I often see tourists making their way up the stairs.
Use the buses. Really.
In most American cities, the bus network is just grim. In London, it's something everyone uses the whole time, so it has a budget, it's (relatively) clean, and it gets maintained. Very different deal.