I think the image oversimplifies the problem on a huge level, but I suppose that's what image macros are for. My issue with Metro is that it throws away any semblance of being able to mass multi-task and on a broader scale hampers my ability to get work done, which was the entire point of the desktop UI paradigm we've had since the Amiga in 1985. In Windows 8, Metro only allows you to have one and a half applications on the screen at one, regardless of your screen resolution. From a tablet point of view, that type of multitasking makes sense since more often than not you're going to only have a few apps that you use heavily and the only ones that are persistently running in the background are something like social media or music player apps where it make sense to only them show in a reduced functionality sidebar-type layout ("half"). They are largely media consumption devices and it's the very reason that the iPad is as successful as it is despite having a half-assed multitasking implementation.
One specific example of this using a real life scenario is editing work I do for a friend that runs a YouTube channel. At any given time I have the following applications running: Firefox, REAPER, Adobe After Effects, Photoshop, LibreOffice and any other miscellaneous software required to interface with my audio/video equipment. To produce a video, I drag and drop the audio into REAPER and do some post processing such as changing audio levels and cutting dead air at the beginning and end of the recording. I then save it in a folder that I already have opened full of raw materials necessary for producing the video. I drag and drop the audio and video into Adobe After Effects. I then switch to LibreOffice which has my notes on where to cut and how much as well as any required special effects based on an email exchange I had earlier. Once the video is edited and finalized, I pull the title card into Photoshop to add the text for the title of the video and import it into After Effects and then set the video off to render. Once it's completed, I switch to Firefox and upload the video to the channel. None of this is unreasonable nor is it an uncommon workflow for video production. This is all perfectly fine on Windows 7 or to some extent, Windows 8's desktop UI.
Now, imagine that same scenario using only Metro. The example I gave is the baseline for a video game review, which is fairly easy to edit in less than a day. However, I have had videos that take me several days or weeks to do and make the flaws in Metro even more significant. Instead of devoting time to editing the video, a significant portion of my time would be spent switching through apps because I can only have one useful app on the screen at a time and having to trudge through "open" dialog boxes that may or may not save the path in order to get to the files that I need. It would significantly slow down my work flow and what would usually take me around a couple hours to produce could take me near 3 or 4 times longer due to not having everything I need front and center. This is a problem because as they say, time is money. I'm not exactly alone in this scenario because people use Windows to get work done whether that be video editing or some other non-trivial task that requires interaction with multiple applications at once. Because of this, it wouldn't be at all outrageous to see the majority of Windows 8 usage on PCs being in the desktop UI while using the Metro UI as a glorified application launcher making this whole endeavour rather useless aside from creating a viable tablet interface and maybe trying to lock 3rd party distribution out with the Windows Store.
Sorry for the wall of text and essentially writing a blog post here, but it's the only way I could think of to illustrate the fundamental problem I have with Metro in Windows 8 from a critical point of view instead of an emotional one. All that said, I think some of the new features are neat such as storage spaces (though I wish it had block-level check-summing to prevent silent data corruption a la ZFS), the "Refresh and Reset" recovery option, native support for USB 3.0 to negate the requirement of shit awful 3rd party drivers for the controllers, hardware acceleration for all UI elements, DPI scaling that works properly, and some new multi-monitor features that have finally been built into Windows that you would otherwise have to use a 3rd party application for. Oddly enough, I also like the new ribbon UI in the Windows 8 Explorer as opposed to Windows 7's that hides all the functions that Microsoft determined from their survey stats were seldom used from me and replaces others with clunky text-only buttons. Having used it in Office 2010 (not 2007, good lord), I felt like it struck a nice balance between functionality and simplicity. It's all kind of bitter sweet, really.
Andrew Ryan wrote:
What is the difference between a man and a parasite? A man builds, a parasite asks, 'Where's my share?' A man creates, a parasite says, 'What will the neighbors think?' A man invents, a parasite says, 'Watch out, or you might tread on the toes of God...