Well, I have a Coachmen class C. It's over twenty years old, so it may not be a good indication of how they are doing things these days.
There are some areas where it's definitely built to a price point. The fit and finish of certain bits is not superior, and some materials are pretty low end. I'm not talking so much about appliances and such, which are largely the same few brands for any RV until you get to the really really high end custom models.
On the other hand, the basic design of my class C is sound, the wiring and plumbing installed neatly enough and using approprite materials and techniques, and there's generally sufficient access for maintenance and repair needs. Things work as expected, albeit age does take its toll sometimes. On the whole I think they did a good job of choosing where to save money to meet their price point and where they didn't; for things that matter for functionality and safety, the work is entirely satisfactory.
Entry level simply means it's the lower end of the cost spectrum, and hence the materials are inexpensive options and the workmanship not overly exacting. A Honda Civic is an entry-level car for the same reasons--not necessarily a bad car, but not one featuring exotic leathers or hand-stitched steering wheel coverings. My ranch house would probably be considered towards the entry level side of hoses, and so it doesn't have granite countertops or high ceilings or other similar luxuries.