By the way, I don't agree with this "the car should have stopped before the wall" nonsense in the lawsuit. Just to be clear on that. The car simply has no such feature at this time and it is not reasonable to expect such response from pretty much any car built in 2016. Production cars don't do that yet, except some in very specific scenarios that don't involve your garage.
Would it be nice one day? Sure. Maybe we'll see some cars in 2017-2018. Maybe it will be standard in 2020. But not yet. (And there is a genuine debate to be had on the pros and cons of such features.)
What legitimate there can be in this case IMO is 1) the customer's experience (which may well be genuine, even if mistaken), 2) conversation about whatever confusion things like rapid EV acceleration, stalk and driving mode arrangements etc. design issues may cause (and what education or adjustments might be useful), and 3) debate on how Tesla should have best handled the unfortunate-for-all incident (what responses cause the best results). Those I find legitimate. The auto-stopping angle, no.
There is a fourth one, which is the extremely remote chance that the car misbehaved by error, but I do not find that likely.