One thing you have to realize is that these trailers are stick build by humans and get tossed around on the road. Some are built very well, yet the odd lemon will sneak through. An RV is something that has to be maintained, regular checks, etc. If you leave it (or abuse it), you will have problems. Most people I know that have major issues with RV's are the guys that are going 65mph down a gravel road, or 85mph on the hwy. They wonder why everything falls apart, lol.
I have had minor problems (most fixed under warranty), and have been very happy with our KZ.
BTW.. No matter your price range or builder, you can (and will) have issues. It's best to expect (and look) for issues sooner than later.