Don't take my word for it, they fooled the WSJ among others:
Permission to Procrastinate: Wait to Get a New Laptop
It's easy to say "No one listens to Mossberg" but I actually had to put up a fight over deploying Windows 7 due to his articles. I've made sure to rub it in now that my boss knows 8 is a dog.
Well, I would "assolve" Mr. Mossberg on this.
Basically if you have available the XP source code (possibly merging in it the "embedded" version, which has some - sometimes MUCH better - features) and you attempt to better it (without intervention from the marketing department and kicking HARD a few a**es around) you would get an almost "perfect" OS.
If you add to it a whole number of senseless features, a completely unneeded set of new subsystems, NOT adequately tested/experimented, you get Vista
If you learn by experience, refine the thingy, fix the most evident bugs, you have a Vista SP1 (which after all is not that bad - I cannot believe I am writing this) and if you go a bit ahead you will get a Vista SP2.
Then comes the marketing department that starts calling the above "Windows 7"
but the OS you have, while FAR from being perfect, is however a not-that-bad results, and you can later issue a Windows 7 SP1 (please read as Vista SP3
Now, if you add to it some nice features, increase compatibility, and §@ç#ing leave the interface "as is" you would get a better OS, Vista SP4
(which the marketing department will insist on calling "Windows 8" and promote as a "brand new OS, a complete revolution, a quantum leap, etc., etc.).
BUT the thingy is essentially a (revised) Vista
You cannot really convince people that it is something new, let alone "revolutionary".
So you add a completely new interface that besides being ugly, is also non-productive on at least 2/3 to 3/4 of the hardware on which people will expect it to run.
Of course in the remaining 1/3 to 1/4 new, mindboggingly powerful and almost, but not quite, UNlike serviceable hardware the new interface, besides being "new" may also work, but if you are a technical journalist and write in April about a product that will be
delivered at the end of October you may be tricked by the marketing people describing the half-@§§ed mish-mash as the second best thing in the world after ice cream was invented.
Seriously, if you could de-componentize Windows 8, removing the senseless interface and much of the fluff, it would be easy to get a "sound" Vista SP4, there would be nothing that you would be able to call "revolutionary", you would have an "evolution" of a previous product (a rather "solid" one with a few useful missing features added) and the mentioned 2/3 to 3/4 users would be happy about it.
If you prefer, a 9 year old kid would have done that, issue being that the OS was put in the hands of 5 or 6 years old children, instead.