Nope.
I would strongly suspect that if you are picking faults and doom mongering before the first example of the stock has been constructed, let alone entered squadron service then you have set your face against them from the start.
Reading the main 800 thread is illustrative, wibble about how you'd need a rope and tackle to get up and down the sloping floors between the carriages and buffet trollies wouldn't be able to make it through, how the diesel engines would be unbearably loud etc. each of these has been debunked and the complaints from this hardcore of naysayers gets ever more petty. They are not representative of the travelling public, as they started on this game before the 80xs left the drawing board.
HSTs have been around for 40 odd years, we've all travelled on them, we can make a judgement based on repeated long term experience of travelling on them. We can see their reliability records. We might not come to the same conclusion, but it is at least based on something that exists and we have extensive real world experience of, not blind prejudice.