Wow, this is a great Metro system, It is fast, clean, and well maintained. It's surprisingly affordable, and it goes all over. Different lines feel different, which is cool. Part of that is the age of the trains. I really like the big bright ones that go to the airport.
A Metro Map is close to an essential if you will use it much. It will help you remember where to change trains.
There are a few minor issues, like on my last trip the voice announcing the next station was quite. I liked the voice so I didn't have to keep searching for station names. Which leads to issue #2 some stations need to be better labeled. That problem was, not surprisingly, especially and issue in stations undergoing work. Those two problems led to me getting off at the wrong station one time. I didn't see a name until I was outside.
Tip: I find I never ride the Metro as much as I think I will, the main tourist area in Madrid is fairly compact so I usually like the walk. I would advise, don't buy to many tickets until you are sure you will need them.
Wish: that airport line would be extended to Gran Via or Sol (better yet both).
Biggest grip? Many stations are very spread out with lots of stairs.
So yes I do have some issues with them, it can get better. Still I don't know a mass transit system that does it better. read more