Quality is subjective. For one person, a loose screw is no big deal but another person might think a loose screw will be the end of the world. The truth is, ALL have problems, ALL brands will have people love then while they will have an equal amount of haters.
I personally believe that shoddy interior workmanship is indicative of shoddy overall building practices, but higher quality almost always comes with an appreciably higher price. Most people don't want to spend Spacecraft brand money for a camper that is gonna sit in their driveway or storage 90% of the time.
For the 4 plus years that I have been on this forum, alot of people have commented that Jayco, Lance, Northwood and Airstream seem to have better than average quality (but what is average anyway?). Not to say that there aren't others that will build an acceptably decent vehicle, but they are all rolling houses on wheels and something will inevitably break on anything.
I have a Flagstaff HW camper, and I have had to have it back to be repaired on several occasions, for things like the A/C, fridge and electric roof lift, but these malfunctions aren't inherit to Forest River per se, but more problems with the supplied parts, but all manufacturers use these same brands..Dometic, Coleman, etc.
If a manufacturer were to build a camper the way they could be built, not many people could justify their price, and your RAV4 couldn't pull it.