That's not unfair when the only thing fundamentally wrong with it relates to very easily-changed aspects of the interior. It's like saying you won't buy a house because you don't like the sofa the current owner has in it or the wallpaper in the back bedroom.
I only partially agree.
Many people dislike the seats, the colour scheme, the number and volume of the on board announcements, and other internal features.
These are relatively easy to change and hopefully will be changed. They are also subjective, some people like the seats, others like the colour scheme.
My objections are more fundamental.
Too many services are short formed. Advocates of the IETs will claim that such short formations are not "regular" nor "frequent" however whatever the terminology used, anyone who has had to stand to Cardiff or Bristol on a 5 car DMU will consider this to be a backward step over sitting on a proper intercity train.
This is not subjective, virtually no one considers a shorter train to be an improvement.
Secondly these new units have no buffet. Very few people consider "no buffet" to an improvement. A limited trolley service that might or might not reach ones seat is not a proper alternative.
Whilst the ability to lengthen 5 car units to full length 9 car is an "essential requirement" I doubt that anyone really expects this.
The ability to add a buffet is also an "essential requirement" but it seems unlikely that we will see a proper hot buffet. A microbuffet perhaps, otherwise known as a static trolley.
To return to the house buying analogy above, the IET is comparable to purchasing a house that is too small, and then wondering if it can be extended.
Too short and without buffet, are more fundamental objections than colour schemes.
