However, I cannot speak with any authority (or experience) on the situation re public transport, especially transport by bus, in the US.
In Europe, trains tend to be excellent, and buses - inter-city buses - pretty good, as I mentioned already, clean, comfortable, punctual, reliable, safe, and reasonably priced. Plus, these days, buses and trains usually have wifi, as well. Within cities, transport varies, but, in general, public transport is pretty good, and sometimes, it is excellent.
Elsewhere, things are different.