I'd say their Achilles heel isn't gaming. Gaming is a symptom of their fatal flaw, which is that absolutely nothing can ever be expected to work out of the box. There's always some driver issue or some obscure configuration that's set up a weird way, or the compatibility layer doesn't translate that bit of functionality, or a lack of alternative software with actual functional parity...

They may have gotten better, but they're still orders of magnitude behind where they need to be in order to get any sort of adoption outside of the enthusiastic autist sphere.