Generally, the Metro system in DF is easy to use, fast and cheap. Some things I have noticed though:
- It can be uncomfortably hot inside the cars, as they are not air-conditioned.
- The length between stations seems quite long (compared to say Paris or New York)
- On a sociological note (and unlike Paris or New York), it seems that the system primarily serves a lower economic class. It is a bit surprising how different the mix of people looks underground vs above ground.