Thanks for the insight. I was thinking about the door handle issues mainly. Heard some stories of them not working and prevents the driver entering the car.
So these are some of the driveability issues I remember from largely your early car pool (I am saying early as in easily up through their June - Aug cars for 2013).
12V - Car will not turn on at all without this. You can have a full 85kWh pack (and now 90) and it doesn't matter. You sub systems all run on the 12V including engaging the drive unit and electronic parking break. So the fact that probably the first 2k cars (maybe more than that? It was a pretty large number I recall) all had bad 12V is a pretty huge issue. Thankfully many were able to survive on their poor quality 12V's to get taken care of during normal maintenance.
Random Pack Failures - Quite a number of early cars I remember getting reported that the pack just died on them randomly... can't drive the car if your pack (or even just a small part of the electronics of it) have failed.
Random Drive Unit failures - Again see above. This is not referring to just those with drive unit noises... which in many cases were low impact and just an annoyance more than anything.
Door Handles - As you point out, this was a bit subjective on what the issue was. Some reported some extreme cases like crawling through windows, sunroof, or over the back seats. While not technically a "driveability" issue, that is far from a "minor inconvenience"
Leaking windows/sunroof - Depending on location (e.g. anywhere other than California where it, sadly, never rains) this is a larger issue for some more than others.
Failing touch screen - Basically undriveable...
Those are what I can remember off hand, it has been a while, and most of these issues are not near the issue they once were. Sure you are going to have these failing still, just as anything can fail, but we are talking about a much, much lower failure rate to where you just happen to be the unlucky winner of a bad part...
So what issues have we had with the X keeping them from being driven? The doors mostly? Someone was complaining about some software glitches, which while annoying, is cheaper for them to fix than replacing broken hardware... Like the car doors randomly opening, or the parking brake randomly engaging... What else has there really been? So despite all the hate, I would say that thus far the X has been a much better rollout than the S since the issues seem to be more annoyances that aren't right, rather than the whole slew of issues which kept cars from even being driven at all.