Perhaps it is just perception but when I look at slightly older mustangs they do not seem to age well compared to older Miatas, for instance (the other examples cites are too new for much comparison in this regard). The drivetrains may be durable but from what I've seen of the rest of the car the Mustangs start looking really worn after a while. On the other hand, even the older Miata seem to be in good shape. This is just based on personal observation of cars I just walk past, nothing scientific. A lot of factors go into this not least of which is how well the respective owners take care of their cars. Still, I just don't see the Mustangs as holding up too well to usage over time.
Solid axles are awesome. I love them in my Jeep! Very simple, durable, cost effective and currently the most favored axle / suspension configuration for off-road use. They have their place and uses but I wouldn't necessarily want them on my sporty road-car. That being said rear control link setup for the Mustang solid axle is very intriguing. Intersting to see how Ford attached it to the chassis.
The truck comment is right on. Big American pick-up trucks are very well made. I haven't been into large trucks for a while so I haven't taken a close look at the competition from Toyota or Nissan. But the Ford, Chevy, and Dodge offerings certainly seem to be very durable. Just based on past experience alone I'd have no qualms about any of the full-size American trucks wiith a preference for Fords. My Dad still has his 1976 Ford F250 and it's still going strong after 30 years. My aunt's '86 GMC crew cab is 20 years old is still providing a lot of cheap, reliable service. And I think the newer rigs will be even better over time.
Getting back on the topic of the G6. . .
found this on the Pontiac website. Click the arrows to the left and right for a 360 deg. spin. And clicking "Exterior", "Body Constructin", "Interior", or "Drivetrain" peels off layers of the car that can be rotated in 360 deg, too. Significantly better than past Pontiacs and the clean lines are nice. Still think the car looks nose heavy. . . something I've never liked.