I'm always of the mind that many Americans don't quite "get" what an April fool's prank is supposed to be. It's supposed to be VERY believable, something which could occur in day to day life and become accepted without a second thought, with ONLY the revelation of "APRIL FOOLS!!" shattering the previously accepted belief in the thing. These contrived, amateurish and juvenile attempts on the behalf of these big corporations are... just stupid... and why do they even bother?
Leo Laporte @ TWiT said, yesterday (not verbatim, but this is the gist of his sentiment): "I kinda worry about the focus on the product development of companies who clearly spend MONTHS pre-planning these 'pranks' - I worry that they're spending SO much effort and energy on planning these pranks, which is time which they may be better served to put into improving THEIR PRODUCTS."
Erm YUP, why WOULD you invest so much time and energy on such trite and childish, transparent guff!