I felt the same way after we bought our 2012 337xl. Frankly, if I had read the threads prior to the purchase I likely would not have bought one. Funny thing, anyone can view the FR posts, but when I go into Tiffin, I cannot read the posts concerning the Allegro.
I visited the factory this past summer. I have a new appreciation now that I have seen how they do it. After the coach is completed it goes to quality control and they stick little pieces of tape on everything that needs fixed.
I saw a new coach just back from QC and there were dozens of stickers all over, inside and out. They spend a lot of time inspecting and fixing, sure they miss stuff that we owners catch. Most of the issues I have encountered are labor related. QC should be addressed on the floor. Anyone who has worked in a manufacturing environment like me knows how difficult that can be. When the body is assembled there are about 20 technicians in the RV at one time.
I have had my RV for 1 year, have used it about 100 days and 30,000 miles. It has not been in a shop. Although I have had to tighten fittings, and fixed small things. I understand that FR contracts local individual dealerships. If I got no response like something like a converter missing, I would likely sit in the owner's office until one was on the way.