Transport infrastructure should be built to be enjoyable, on top of usefulness. The Soviets have done exactly that (even though they meant to flex).
https://www.nytimes.com/2021/11/01/travel/soviet-era-metros.html
New York's abandoned City Hall station was quite nicelooking, but then the subsequent #subway stations are just... ugly.
Although many #metro stations in the world now feature art, the overall structure often feels... dull. It would be hard to completely alleviate the problem, but maybe more colours or lighting can help.
Yeah, I don't use public transport much (there's literally none where I live) but the few times I have it feels very oppressive. I can imagine having to use it 3-4 times a day, everyday must weight in on you after a while.
@austin
It is true that the Montréal Metro isn't too bad. Very exposed concrete-esque but that's the nature of the period it was built in.