We are on our third camper, our first two were Keystone toy haulers, 1 bumper pull Raptor (re-branded next model year as a Carbon), 1 5th wheel Impact. Never had any major issues with either one of them. Worst thing that happened was the front AC died on the Impact, and that was due to a defective AC unit itself from Dometic. Even with our new Montana, other than a couple really small items, it's been fine, and 3 of our 4 trips this year were down bumpy dirt roads. 2 full hookup spots, 2 boondock spots. Weather ranging from below freezing to 90 degrees.
I think as long as you go in knowing there may be a few little things to fix along the way, you'll be fine. I'm in a few Montana Facebook groups and the stuff many people get really worked up about, seems really silly to me. One lady posted a picture of her "defective" glass stove cover because it wouldn't fold up completely out of the way. Turns out it was just folded wrong. It's a moving house that gets bounced around down the road, stuff will happen sometimes. And, as mentioned above by others, it's only the people with the problems who post most of the time.