Mossberg makes a budget gun.
Nothing wrong with that, so long as you understand what you're getting. Some Mossbergs (like the 500 shotgun) are time honored and well proven. Some others (Plinkster) are ok, but not up there with the leaders in the category.
I expect this one to be just fine, but fit and finish on the handguard is likely to be so-so (since high quality free-float handguards run $200-350ish), and the rifle itself to be serviceable but not quite up to the standards of some other rifles that come with more expensive prices... You don't see complete BCM, Colt, LMT, Noveske, Daniel Defense, and Spike's Elite rifles running $1100+ because they pay the janitor extremely well. That's just what it costs to use high quality metals, perform exacting quality control inspections, and the like.
A budget gun isn't a bad thing and will likely serve most people perfectly well, but that doesn't necessarily mean it's a superior product. It doesn't mean it's junk, either. It is what it is, and that's all it is.
I'm not sure why pointing out something is going to be built to a budget price is seen as trashing the product. It's calling a spade a spade.