If there are a few other American posters on board that can attest that would be great, but count me in for, "no, the styling of the original xbox didn't help in sales in the states".
Nobody thought the original xbox looked good!
The only thing good about it was it had a top-class GPU and a HDD which enabled some really cool game experiences for equal price to a playstation2.
Us Americans were able to look past that ugly mess and see it for the inner beauty it had!
Actually I'm an American & I thought it looked pretty good. But I was more drawn to it's PC centric nature. So going from a huge PC to a small Xbox was a godsend. But on the other hand, it was the beefy GPU, CPU & hard drive that really made me take notice. I think you'll find that a lot of PC gamers were drawn to it for those reasons. Once it came out then everybody realized that it was an awesome system for first person shooters. I haven't played a FPS on the PC since.
BTW, to keep it on topic of nationalism. I absolutely believe nationalism played a part in Xbox sales in the US. Just not sure how much. The last true American console was the Atari Jaguar. I think people were really excited to see something that wasn't from Japan. BTW, 3DO doesn't count since they had Japanese mfgs build the systems. However, I was excited about it for the same reasons as Xbox. I just don't think many people in the States cared especially after the initial $700 price tag.
Tommy McClain