I actually am liking it the more and more as I use it. First, the metro tile screen is your start button. While yes I wish they would make it more clear when on the desktop, simply moving to the bottom left corner brings it up. And I like how the live push notifications go to it. And man is it customizable. On the old start menu, I had to go to the vendor, and then click on the application to launch. And it was a nested menu structure....games->Sid Meyers->Civilization or whatever. In the metro screen I can pin all my programs together....all my office aps (MS Office, Adobe, Quicken) can all be in the same group, all my media apps in one group. I can unpin shortcuts as I need which really helps clean things up. I'm really thinking of how much easier it will be to customize and locate stuff I need. And if you don't have a tile on the metro menu all you have to do is start typing what you're looking for and search is performed.
I have seen a lot of negative reviews about the learning curve, but I've found that just by spending an hour or so with the system, I find multiple ways of doing something. Like moving to the previous program I can go the top left corner. To go to another running program I can Press alt-tab, press the windows key - tab, go back to the metro menu on the bottom left corner, or the old stand-by of doing crtrl-alt-del to get to the task menu.
And man, is this thing fast. It boots fast, shuts down fast, and loads an application very quickly. The metro aps are very quick. It brings snap in to system that I haven't seen in well, forever. Control panel opens quickly. Loads everything in a matter of mili-seconds. And so far, I haven't found a program that I can't run in it that I could in Windows 7. Did I mention that spell checking is like universal?
What it is lacking in....well yeah a start button would be a welcomed addition on the desktop. Something larger to click on then just the bottom left corner hotspot. An easier way to sign off and / or shut down. The metro aps don't like music, video's, and pics stored on an unindexed network location such as an NAS. But media player and media center work as expected.
I would love to see Microsoft incorporate Kinect in to this. Add in hand gestures, along with a good voice recognition routine and man, would that be awesome. I'm sure they are already working on it.
All in all, I'm really liking this flavor and might adopt it on release. To all you Windows 8 haters out there, I suspect you haven't given it a chance. Just because it doesn't have a start button doesn't mean you really need it. We didn't have it back in the window's 3.0 or 3.1 days and managed to survive. Microsoft has finally come out with something that works well across many devices. I really can't wait to see how partner vendors take the os and expand on it. The boost in performance alone is worth the learning curve.
I'm not really a fanboy. I'm pretty open to any system. I've used Mac's, Linux, and just about every version of Windows. And yeah, I'm first to admit when Microsoft has a big miss. But I don't see it on this version.