Well, whatever is rattling around in there doesn't seem to have hurt the image quality, from what I can tell.
When I was first starting to get serious in photography, I remember that the overriding opinion was that most low-end zooms, particularly third party zooms, were mostly junk and better used as paperweights. So, of course, I started buying all primes. But over the years, I've acquired quite a few inexpensive zooms, mostly from third party manufacturers. Some were included in with other equipment, some I purchased intentionally. There have been a few that were not very good, even for my less than exacting standards. However, most have been perfectly adequate for my uses, which is mostly hand-held middle aperture type stuff.
That's not to say that cheap zooms are on par with the more expensive stuff. I don't really have any expensive zooms to compare to. Just that I'd probably have been just as happy running around with a couple of zooms as opposed to 3-4 primes in the bag, if not more so due to the ease of use when not having to change lenses as often is factored in.