I hear you loud and clear on Bootstrap lol.
Like any new technology that comes out, it's never the way we want it to be but it's the potential that it has for down the road.
Buggy, for sure, i've seen lines or little squares using the glyph-icons.
It's very intimidating when you first look at it because of all the CSS so to make the most out of it, the designer would need to know how Bootstrap works or frustration will take over.
I don't think it would be a bad idea keeping up with where they're see more headed in the future and how much complication will be eliminated.

If so many Bootstrap Powered websites would be cloned like, it's because the designer/developer wont look outside the box (eg. i want gradient instead of solid colors, i want rounded corners instead of squared, i want to over ride the width to stretch all the way across etc.)
I personally like Bootstrap in some cases because the elements we use are already styled and if i want to change just the color but leave everything else, i can do that.
Like everything else though, there's pros & cons to it.