I've been in plenty of Superliner's that rattled every bit as much as the Viewliner's do. As for the bench seat, it's 3 inches shorter than a Superliner's, but that's some designer's fault, not the car's fault. Regarding the latches and locks, while I'll admit that I'm upset that Amtrak replaced the originals instead of fixing them, the new locks are identical to the Superliner locks.Maybe its me, but the bedrooms not only have every possible rattle known to trains and at way higher volumes and lower bench seats that are too short for many to nap on without bending your neck way out of shape. The doors are missing most of the original latches and have hardware store replacements leaving holes in the doors. (high quality). And for another I very much disliked the disconnected look to the roof lines of the rooms. Its like being in a room with openings going off in several directions, just not a bit cozy like pullman or superliner bedrooms. The roomettes one saving grace that some seem not to like is having its own toilet. But again in the old days they were much better at blending them in out of the way than the new one is. I think the word for it might be "Cheap", except the fare. Oh yes as long a were on the viewliner trains, the diner is pitiful and the lounge is nearly nonexistent. I would take the Cardinal any day for quality of equipment and view. The equipment may be getting old and has its own flaws but in all my many sleeper trips the viewliner won out as worst by a long shot.
As for Viewliner trains, they don't exist at least yet. It's not the fault of the Viewliner sleeper car's that Amtrak didn't buy Viewliner lounges, coaches, and diners. And the Cardinal uses single level equipment and a Viewliner sleeper, so I'm very confused by your statement that you'd take that any day for the quality of equipment.