Both the cases I've used, a Coolermaster Elite and a Corsair carbide 200R, have presented 'cheap' material problems but not as bad as those described by the OP.
I bought good quality set of replacement (6/32) thumbscrews for the Coolermaster as it only came with a pair of thumbscrews for the right side panel. I couldn't fit any of the new ones in two of the screw holes, one on either side. When I looked it was because the, threaded, inner screw holes were through small projecting metal tabs not the main body of the case. These tabs were very slightly bent, I'd suspect during factory assembly, and only the original screws, probably slightly bent themselves will fit.
I thought about straightening the tabs but reckoned the chance of shearing them off was high as they had been bent already. So I left it.
There are also issues with some of the side panel fan screw mount holes where, because of the relatively thin paneling and, I suspect, not a perfectly perpendicularly made screw hole it is horribly easy to over tighten the screw and force the head through.
What's with the use of those typical self-tapping fan screws anyway? They are just a lousy design for mounting through metal panels. The heads should be wider and flat not countersunk. The panels' screw holes could easily be pressed during manufacture to accomodate flat heads rather than countersunk ones.
Whilst on this subject: why are the holes in the panels themselves simply not drilled smaller? In both the cases mentioned they are wider than the diameter of the 6/32 fan screws typically used which makes them dangerously close to the diameter of the head these screws have.
That is where the Corsair case fails because it tries to resolve the problem by fitting all the fan mount holes through metal panels with rubber grommets. However because the screws are self-tapping this means the raw holes have to made wider to accept grommets with the internal diameter of the screw. Result: because the rubber used is quite soft, if repeated too many times during the build it gets damaged by the self tapping screws quite easily and splits.
As the hole through the metal panel is wider than the screw the problem described with the Coolermaster repeats.
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