This isn't said lightly, I have always been a Microsoft kind of guy, but if Microsoft is planning on shipping this (I am posting from it now) operating system in the next 12 months, it can't do anything besides fail.
Are things stable, sure. Do I see crashes etc? No, not really.
However, I am a Windows guy, been using Windows since...well, since Windows came out.
I bought an iPad, and having never used any of the Apple OSes that had GUIs, it was very easy to use, very intuitive.
I bought an Android tablet (Asus Transformer, absolutely love it), never really doing anything in Linux, very intuitive, very easy to use, but slightly below ease of use of the iPad.
Then Windows 8 comes out. I have installed it on my work laptop, my home workstation, and went out and bought a tablet (Acer Iconia W500, love it, not digging the dock after using the Transformer's *awesome* dock).
The Windows 8 user experience is a wreck. Using it from a keyboard and mouse, and using it from a tablet are literally like having to learn two OSes. Everything behaves totally different. I've been using Windows all of my life practically and it is the first OS I have used in the last decade where I literally started thinking I need a manual. I find myself looking on the internet looking for hotkeys for things because it is so much less efficient to navigate to anything that isn't on the start screen than it ever was in prior versions of Windows.
And god forbid you have 2 monitors. It's all like 'hey look, I get a task bar on both screens now! Welcome to 10 years ago!" Then you realize it is only an illusion. So far it looks like they only mirror each other, so it isn't really providing any value. And, awesomely enough (not), if you move the one with the clock to your other monitor so you can, I don't know, SEE THE TIME, that is now where metro loads, so it again covers the clock.
Also, metro seems to be so half baked as to be ridiculous. The back button on the mouse doesn't go back, the escape key doesn't close the charm/menu/whatever you pulled up, except, oh wait, sometimes it does. If you are working on the desktop and open metro, and then click on your app on the other screen, metro goes away. However, if you do the same thing, but this time open an app before clicking back to an app outside of metro, metro just returns you to the start screen. It's like rolling dice to see what behavior I am going to see at any given time.
If you open a movie or music in the metro app, you can't lower the volume of the music without lowering it for all of Windows. And if we take this a bit further, technically, it should be a Metro feature, you should be able to individually control any apps volume in Metro, since it is the fancy new interface. Come on, give us 2012, not a worse version of 2000.
Removing plugins from the browser in Metro. Now this one is interesting, I understand, and I think it is the right answer, but give us some codec support. Nothing says lovin like not being able to visit any media sites without hitting the desktop IE or installing a 3rd party browser.
They are calling this a consumer preview, but all I can see it doing is helping Apple sell more iPads. The company I am working at is looking at possibly arming a large percentage of its workers with iPads, and if I went to the powers that be and pitched them on Windows 8 instead, my next blog post would be about me, looking for a job.
Microsoft is struggling lately, and Windows 8 sure isn't the cure.