It seems that there is lots of variance from device to device, some people get the HW faults and some have never seen any. (like myself, no HW problems with my device)

The problem obviously is not Jolla's but with the OEM who makes the devices. (what this means is of course that Jolla should have a tighter leash on their manufacturing partner. OTOH it is not possible to do that when you are a small company, when compared to the large players that can screw the balls off their MFG partners...)

All in all, the device feels pretty much on target regarding quality for the money.
When compared for example to the current Microsoft lineup of devices, there are about similar level of HW defects found on the phones.