We are considering buying a DP motorhome, but I have read and heard statements like this many times. I just can't accept that a very expensive piece of machinery will have a "laundry list" of issues. Somebody needs to be in charge of quality control and if he/she can't do it, then be replaced by someone who can. Just my opinion.
Even yachts have a laundry list of issues. Look at the Dreamliner. every aircraft has growing pains. even buses have issues. it is a very complicated unit a motorhome is. and lots of systems integrated into a vehicle that is not normally found in passenger cars. Motorhomes are more hand built and therefore not mass produced like a television. So expect a lot of issues. be thankfull you can afford a DP.