Not sure about other countries. In Switzerland, where it comes at 58'000 CHF (basically equals the same amount in US more or less) fully loaded with all options included (awd, 3.3l,360 cam whatever etc), it is basically a bargain, because the next best thing as an upgrade would maybe an Audi S4 or similar, which costs nearly double that (around 113'000 CHF with the same options as the Stinger). Of course the Stinger is not an Audi S4, as there's a few cheap plastics in the stinger, it is too heavy at 1900 KG etc ... but still, the price is good for what you get. I can't talk, yet, about real value (which means the stuff has to last a few years without breaking), but directly on paper, the Stinger is great value.
The "Only Kia" argument is silly by itself. You pay the things you get with the Stinger at a good price. You don't get to pay less for this giant package of big engine, leather, 360 cams and so on just because "it's a kia", especially since it's already at half an Audi. The only place where this can matter is resale price, where Kia does not have any prestige (but is slowly being a totally accepted brand around here).