I wouldn't say that Jolla apps are a good representation FOSS,
I don't really understand your relation between FOSS and the quality of software. In my experience, it's the other way. Have you seen Google Play? The vast majority of apps there are closed/proprietary, many of which are made by non-developers, students, etc. with little experience who want to jump on the "app" bandwagon and the quality is atrocious in most cases.
... FOSS is seen as a bunch of wild kids doing their own thing in a basement ...
Hand on heart, that reputation is by and large justified. The vast majority of FOSS is crap.
As for reputation, I'd argue that FOSS doesn't have a reputation at all amongst the general public. Most people don't know what FOSS is, and those that do know what it is, generally don't have a strong opinion about it.