Overall, after using the RTM for 3 days, I'll go out on a limb and say that Windows 8 isn't all that bad. It's not a horrific release by any means. It's Windows, people will figure it out, it's performance IS good and it appears to be stable. I wouldn't lump Windows 8 into the same bin as ME or Vista....it's far better performing and less flawed than either of those 2 OS's were. And for dual monitor use, they have made some really nice improvements in Windows 8.
However, I think the bigger concern really boils down to whether people want the changes that accompany the release. And I truly believe that these items really can be a "make it or break it" factor, especially since some of the choices are quite limited or simply non-existent. And I can completely understand, if based on these factors, people say that Windows 8 is awful. For them, it might be, and no amount of convincing is likely going to change their mind.
So, when am I going to get Windows 8 onto my main rig? Well, it's unlikely to happen until I buy another computer. And here are my reasons for this choice;
1). The themes and lack of Aero really make it look drab and plain. Especially on the desktop, where I will do most of my work. The interfaces for the Metro apps are far flashier and fancy, but I don't really plan to use them. Why can't my desktop look nice too?
2). Metro for me on a desktop, is just not needed. It doesn't help me in any way. I have 16 apps pinned to my taskbar in Windows 7 and that covers 98% of what I do day to day. I have about 6 other shortcuts on my desktop for things that I don't do regularly, but don't want to hunt down in a menu). The rest can sit in the menu for all I care, I don't load a bunch to my machines anyway. My work laptop which I use the most, and load the most stuff too, only has about 60 Program Folders and that's counting the bog standard Windows groups like Accessories, etc.
3). the software that I have already purchased works on Windows 7. Things that I prefer to use slightly older versions of, like Acronis True Image. So, by not buying Windows 8 at the present time, i don't have to upgrade any of these older tools.
4). Performance improvements haven't been really noticed much. I'm on quad cores, with plenty of RAM and my desktop and laptop both have SSD's...so they aren't really struggling in the performance arena with Windows 7.
5). I don't like to "upgrade" anything. I would load from scratch. Windows 7 is not broken, working great and is already paid for. I just don't feel compelled to load the OS, reset up my apps, and get various applications like Sony Vegas Movie Studio, Handbrake, etc reconfigured with my personal settings.
6). Running full screen metro apps just isn't all that appealing. I very much like having lots of screen real-estate on large monitors, or a few displays and would rather be able to resize windows and place them whereever I choose.
So, there you have it. Windows 8 works just fine and dandy. But for somebody who thinks that life without "aero" is just drab and boring, having to deal with the Start screen is just an extra step, misses the start button, but has launched IE accidentally many times, and is not disappointed in hardly any way with Windows 7....there really isn't much incentive. Sure, in a few areas it might perform better and make me happy, but it will always have the Start screen and the boring look and feel to the desktop and will lack a built-in start button and that will annoy me always. It's still a better choice for me to stay put.