I mean, do you really consider ditching flashplayer for gnash or lightspark to be a viable solution for a company like canonical (dare I say a viable solution at all)?
Not to talk about the superior rendering, the tab interface, 3D support (admitedly not used much) and the possibility to tweak everything to your taste. When it comes to PDFs, I'm yet to see anything that approaches the bar set by acroread. Having said this, I recently discovered an impressingly fast and keyboard-driven pdf viewer that I use for quick & dirt document checking: MuPDF. For that use case, I recommend it over Xpdf, Okular and company. For those who care about it, I suggest PDF-XChange for document annotation and form-filling. It's got a gratis version and (for once) it works perfect under Wine. Forget abot PS trickery, loading documents in Inkscape or nonsense like that.
While I agree about the poor coloring scheme, at least the positions remained the same throughout all the benchmarks and they where in the same order as the labels so the color did not matter that much.
I wonder though what made Apache2 bork on the 64-bit version, it's basically the only test where 64 is slower than 32.