We were a group of mainly elderly folk returning from a visit to the south we were quite anxious that we had to change trains at Derby because of Sunday engineering. We had had a pleasant through journey south. As we had no reservation from Derby we were relieved to be on a longer and emptier train for the remaining part of the journey. The comment made by my father-in-law which I added as a PS was to me faintly amusing as he linked "bigger/longer" with "newer".
When I pointed out the age difference of the trains his friends added the other comments.
Mostly I travel on my own to Bristol and Bournemouth and I am very happy with the newer trains. I don't "dislike" any model of train-I don't care or know enough about them anyway.
If I am on a train going somewhere then I am not working and that is very good.
I used to hear people commenting on how nice the 'new' trains were on 225s after the Mallard refits.