Right, I'm going to wade in here and say I ACTUALLY LIKE VOYAGERS!
OK, so the West Coast variety over the CrossCountry ones, but that's just because XC are often far too busy, and the catering provision isn't as good on XC as VT.
They're fast, they're not actually all that uncomfortable, they're looked after and kept clean. The huge windows are a joy to watch the world go by out of. The stuff about underfloor engines and vibrations is absolute nonsense, I've never had a problem with the ride quality. I've once or twice encountered smelly toilets, but that's hardly a feature that's unique to Voyagers. And they have a shop/buffet. So long as I can get a coffee on-board, I'm happy. I still find it staggering that as a nation we can justify multiple branches of every coffee chain in every city and shopping centre, but we can't justify providing a few more train services with a drinks trolley.
Actually, my least-favourite stock at the moment has to be Northern's 150s. Now they have vibration issues, they sound awful, especially the ones that screetch along the tracks and sound like fingernails down a chalkboard. The interiors haven't been refurbished since BR days. Toilet doors that don't even close, never mind lock. Dirty floors, worn out upholstery. Oh, and commuter doors and 3+2 seating. I accept that sometimes those are a necessary evil, but not on the rural routes that Northern seem to put 150s on. I'd actually go as far as to say that I dislike Northern's 150s more than their 142s.