The number of failures compared to the total production of this vehicle and its RR sport bretheren is a fact. That fact allows the original conclusion to be drawn. Any reliability analysis will produce the same result. That is not opinion.
The only facts you have are productions numbers and known reported failures. None of us know how many failures have occurred that were either part of a larger collision, potentially being the cause....or with multiple parts breaking as with some of the UK folks who really push the limits on these with larger tires, spacers, and plenty of off roading for real. Lot's of things have broken from all the posts I've read over three years.
By saying your statement above, it sounds like you think it's acceptable for some proportion of this type of failure.... I think it's not at all acceptable and no different from complete brake failure, air bag defects, etc. all of which are unacceptable on a relatively new vehicle.
My first lr3, an 06 hse, sheared the steering column adjusting/joining bolts on the cabin side - more or less on their own after a dealer had the car over a week when a trade was going on. Regardless of who/what, that was total BS and a service adviser tried to blame/say it was due to the 1" oversized tires. My response to which I don't think is allowed on this forum per language rules.
After coming across this thread story, I checked out a couple vehicles build/design in the same wheel/control arm area: The VW Touareg has big solid looking cast/formed parts all over under there, none of the "stamped" and welded type. Similar is the Benz G500. Extremely robust and obviously designed, and built, to last without question.
My current 2007 seems fine, I will periodically inspect these areas though to be safe.