Good post, not much to argue with.
But I disagree about Safe Mode boot. From over a year of using Windows 8, I've literally never had to use Safe Mode. This is considering I've used a Windows 8 To Go drive across several PCs, and a few other PC's I've installed Windows 8 on. Heck, I intentionally had to boot into Safe Mode to see if it was still there! By the way, it is and it's really weird to see Taskbar transparency...
This was done because the boot time of Windows 8 is so fast as it is, pair that with UEFI BIOS, it's almost impossible to get into the advanced boot options. Windows 8 works around that and only presents the advanced boot options WHEN and only WHEN the PC has been booted up several times and the power gets killed or keeps restarting due to some other issue. I think this is a good thing, no more having to see the advanced boot options every time your battery runs out of power.
I also disagree with the mac clone on the Desktop. Far from it. Even still, Windows 7 had the mac clone thing going on. Windows 8 has that, but the Start Screen refutes that.
Speaking of the Start Screen and personalizing, there are over 16 different colors and I think 25 different patterns. LOTS of combinations there. Or, if you go with a third party route, you can customize those colors INFINTITELY. Right now on my desktop, I have a picture of a Start Screen background that I once had with the Developer Preview that is black and has some translucent tiles on the top and bottom. Then I have black tiles, along with a blue accent color. Or, I can have red tiles or blue tiles with that black background. The other day, a friend of mine customized her Start Screen to be more teal and has an ocean vibe to it. You can even have images on the Start Screen to be like the slide show feature on the Desktop. Third party options are out there, like there are for start menus, but in all honesty, a good Start Screen replaces any need for a start menu. If you click on the lower left hand corner of the Taskbar to get to Start like always, put your commonly accessed Desktop items on the left hand side of the screen.
By the way the app I mention is Decor8 by StarDock.
I would also suggest getting a touch enabled mouse. I've updated my Microsoft Touch Mouse and now have support for the gestures for Windows 8. I've got real used to using the Charms bar and hot corners, but the touch gesturing really seals the deal!
And lastly, I disagree with your idea on Windows 8 tablets doing poorly. Couldn't be more far off, Windows 8 tablet PCs offer A HUGE, VAST amounts of versatility and flexibility that no neutered smartphone tablet can even touch, no pun intended. Running proper Office software, AutoCAD, and even iTunes to manage your ipad cannot EVER be done on android let alone a giant ipod touch. That, and how greatly different it looks and feels and acts differentiates themselves over the ipad, which again has a stale looking UI that has been around for far too long, and over android tablets, which are usually knockoffs of ipads with UIs and limited capabilities that make you ask, "WHY?!" I also think Microsoft wasn't too late with touch, or too early, considering they've been working with touch since the early 2000s and even earlier in the '90s. Windows 8 is the first time however, touch is literally on over 90% of new PCs built today, so it's not like a 3DTV thing where only a couple manufacturers make them.
Lastly, everyone will pretty much tell you, don't do an upgrade install. Those are usually crapshoots that end up with more weird things going on than you'd like.