I wouldn't call it mediocrity, just a style that is so radically diffrent yet so the same that it's often misunderstood. I think that's the best way to put the USBM-scene, lost in interpetation. People get to worked up over it. I say just listen to the music, you like it listen to it, don't, don't listen to it.
Yes I agree with that, I listen to bands regardless of their location as well including some American black metal. But I just find that there are so many mediocre American black metal bands that are praised to no end, where as...I find that it just doesn't happen to that extent in any other current scene. France for example gets much recognition but I feel their scene in general is considerably better and worthy of the attention given.