The brands mentioned have their place in the market. They are "light" weight wise and "light" usage is intended. I'm busy with kids, school, sports and work, and only use my 5th wheel 20 or so nights a year. For me that's fine. Someday when the kids are grown and I'm out a lot more often I know I'll need to step up to a more quality unit.
RVs at any price point are a roll of the dice and any manufacturer can turn out a good or bad unit. I've been pretty lucky with mine (Keystone Hideout) but definitely have realistic expectations.
A lot just depends on how much and how often you intend to use it, and how hard you are on it.