I can see that, I guess it's just going after a different use case than I was using it for (i.e. the decent designer-less site). It has no real value to me if I have to go through and style everything over again.
Just head on over to Bootswatch and pick out your favorite theme, that's your new bootstrap :p
My favorites so far are http://bootswatch.com/cerulean/
Wow, thanks for reminding me of http://bootswatch.com! I just checked it out again after having not looked for a while and I'm impressed with the v3-targeted swatches.
The idea of BS3 wasn't so much "flat" as it was a "remove gradients to allow easier customisation". Previously (in BC2) you had to override a ton of stuff to get "sane" buttons again. BS3 just gives you simple buttons that you can add to immediately. Same goes for the nav-bar. I much prefer it this way.