All I can say is the 323s are
excellent by Northern 'West' standards. I don't want to start the Pacer wars here but as a Pacer commuter and I think they are great compared to the downright dinginess and sluggishness of a 142's acceleration, interior and general quality. Perhaps it's different for those who see 142s with 'bus seats' as a novelty.
The interiors may not be luxurious, but it would be inappropriate for them to be so. Maybe you are associating them with the Cross City line or something?
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The doors. The floor. The walls. The seats. The toilets. The capacity. The lack of tables. The stupid noises. The speed. The interior layout. The... well, everything! Isn't ten a sufficient number?
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Doors seem fine to me. Walls are not objectionable. Seats are much better than anything provided by an ex-FNW or Merseytravel 142. Toilets are OK - better than
this on a Pacer. Most local stock on Northern at least doesn't have tables - none on 142/144/150/153/155/333/332. Noises are unique (reminds me of the LU '96 stock - do you loathe that too?). 90mph is good. Layout far better than most Northern 'West' Pacers.
Since you mentioned them being much worse than Pacers, I have tried to compare them.