By that logic, public domain is "ambiguous".
> There's nothing to stop me from taking your code, re-licensing it under say a proprietary license, then suing the original creator.
By that logic, virtually all the "BSD-style" licenses and their ilk are "ambiguous".
> There's nothing that stops me from taking your project's branding/symbol/graphics/name and claiming it as my own and then suing you.
By that logic, virtually every FOSS license that doesn't extend to branding (e.g. pretty much everything other than the MPL) is "ambiguous".
> There's nothing that stops me from taking your work and then not providing attribution back to the original creator.
See the public domain remark above.
> By default there is nothing that absolves the license holder from warranty nor implied fitness for use.
That is true, and would be a worthwhile addition as a default rather than an afterthought.
> legally, what does "DO WHAT THE FUCK YOU WANT" actually mean?
It means "do what you want". Unless you're claiming that lawyers don't have a strong-enough grasp of the English language to be able to properly interpret extraneous expletives (which wouldn't surprise me to be quite honest...).