Now, is it worthy of an upgrade? Probably only if you're upgrading your computer anyway, or once it's caught on. But that was true of Win 7 when it came out.
The truth of Vista and Windows 7, they actually required a pretty hefty hardware upgrade to give of their best. . XP's requirements are much lower than either one. So, you actually did need to buy a new machine for Vista or Win 7. Especially in light of the fact that manufacturers of existing peripherals were dropping the, "writing drivers for the new OS", ball.
When you come right down to it, this Win 8 garbage was shoveled out the door almost before a full Intel, "tic, tock cycle", occurred.
Ostensibly, (and arguably) Win 8 should not only run on hardware suited to Vista & Win 7 but should flourish, and possibly outperform either OS.
With that said, M$ has been making really stupid decisions. For example, hiring the same consultants as Apple, to "modernize" their logo. Money well spent, at least from Apple's point of view.
I shortcut virtually everything on my machines. So, I don't need the crap-a** toy block "Metro" interface, in order to relate to my computer as though it's a cell phone.
Nor am I at the mercy of the start button. I still like to post my photos as wallpaper, I like the task bar upgrade in Win 7. I like everything about the Windows 7 desktop.
As far as, "not giving Windows 8 a chance", I gave it the chance I believe it's worth. Which is none at all.
As for all the proponents of touch interface, are you really going to sit in front of a $400.00 IPS screen, and do all your work by smearing your fingers all over it. Again, I pass!