One of the things that I always like when visiting in a major city is a great transportation system and that is usually achieved with a combination of well designed system of trains and buses (trams can be optional!) supported by shuttle services.
Taipei is clearly at a leader with a superb network which makes 85 percent of the city no more than 15 minutes from any stop and I have always found it extremely easy to use (as well as very cheap) to get around to all tourist attractions.
Look at the size of a typical station and that is only one platform!
There a numerous access points which moves commuters swiftly along.
The signages are both highly visible and clear.
Not to mention enormous carriages with trains that run at very regular intervals.