if you do not know mandarin, it might be difficult for you to go places where mrt not reaching coz u might not able to ask the local and check online. Otherwise their mrt cover mostly all important places you might want to visit in taipei city. Their mrt of coz will put our lrt in shame. If you want to go places outside of taipei, you can go Taipei Station (like our pudu raya) to catch bus. To go Kaoshiong, you can use bullet train.

PS : If you want to go now, it might be too cold for us. My fren said much colder than genting. My taipei fren just came to msia.