I have spent the last couple of weeks travelling by metro a lot here, because it is by far the fastest way to get around. In general they are not as ornate as some of the metro stations in Moscow, but they are efficient and clean, which is the main thing.
One interesting thing is that some stations have doors on the station as well as the train, a bit like the doors on both a lift and each floor where the lift stops. This means that the train must stop at exactly the right place, so the doors on the train line up with the doors on the station.
Some things I see 