So lets unpick this a little - firstly the "poor ride", well since it seems the poor ride on that section of track is also seen on other rolling stock, the finger of suspicion should probably be pointed at the track rather than the units.
Having removed that the remaining complaint seems to be about the seats, their type, quality etc (always a joyous topic here on Railforums) and the general condition of the units.
The 360s are very similar to the 350s which have a monopoly on the services from Northampton - which is a slightly longer journey to Euston than Wellingborough is to St Pancras. The seats on the 2+2 units are fine, the seats on the 3+2 are OK, but given the capacity needed pre Covid during the rush hour it made sense to go with that layout. On the occasions pre Covid when I travelled from Wellingborough to London in the rush hour, you could easily be condemned to having to stand on the journey into London and possibly back to Luton or Bedford on the return depending on the time train you got. The fact that a 4 car 360 has about 300 seats compared to about 240 on a 5 car Merdian which was usually heading onto Leicester and beyond so had the passengers for those, means the likelihood of getting a seat even on a 4 car 360 in the rush hour at Wellingborough ought to be much, much greater.
So that leaves the fare structure - if it bothers you *that* much, ticket split at Bedford which is easier now all trains stop at Bedford. It's easy to forget how much better the overall service Wellingborough gets now compared to 20 years ago.