Compared to what? Ventilation in the tube is pretty bad, train delays and line closures are fairly frequent. Rail is notoriously always having problems. Locals may correct me, but transport in e.g. Tokyo seemed a lot more efficient when I was there.
She got a train from Manchester to London. I'm surprised that the price of this ticket wasn't mentioned (when the £4.90 one in London was). Manchester to London can typically cost anywhere between £40 to £90.
Yes, I was slightly surprised at the whole "flying into manchester then taking a train was cheaper", given how many times I've chosen air over train because of the prices.
When it works and it's reasonably priced and you get a seat in a good environment it's the best form of travel. It's a shame those conditions so rarely all hold at the same time.