And when the is a system, it isn't used - ever been to Los Angeles? 9 million people and a subway and bus system THAT NO ONE USES.
L.A.'s bus and rail system has over 1.5 MILLION boardings every weekday. (that's systemwide: bus + rail)
http://www.metro.net/news/ridership-statistics/
Those 1.5 million people boarding L.A.'s buses and trains every day is more than the population of every American city except for the top 5 (New York, L.A., Chicago, Houston, Philadelphia). (Even if you assume 1.5 million boardings only corresponds to 750,000 people making roundtrips, that's still more than the population of any American city except the top 15.)
Seems like an odd definition of "no one" to me.
I live in Los Angeles. Our system is still under continuous construction/expansion, but I try to use it when it makes sense. Just depends on where you live in this great sprawling metropolis of ours. L.A. is as spread out as London, but London has continuously grown its subway system for over 100 years. L.A. pretty much re-started in 1991.
I am certainly annoyed that the maps app no longer has public transit directions in it. I used to use them quite a bit. Very convenient way to find out when the next bus/train is coming, and how much money it will cost me to get across town. I mostly used it when traveling, which makes it even worse that it's gone: Now I'll have to get the public transit app for whatever particular city I'm in, instead of just using Google's standardized interface.