In what way is that Trash, Microsoft Windows is one of the most impressive software engineering feats of our time. I think i even read it is the most complex and the has the largest source code base in the world.
I think it's incredible and it was something i remarking to friends just the other day. Ive been using Windows since 1, the Win9x line done a lot to bring a desktop on every desk but they were very unreliable. Fast forward to today and it is one of the most reliable OS's around, ive yet to see it crash through a random act, it's usually due to heat or bad hardware. To think that this OS can work on the billions of combinations of hardware is incredible, your motherboard alone as a vast range of technologies, sound card, network, SATA controllers, PCIe controller etc.. thats before you've plugged in a HDD, CPU, RAM etc..
Does this mean that others can't do the same, no, Linux is reliable on a vast variety of hardware. Mac OSX is a different beast due to the vertical stack of how it's placed, but it's not hard to imagine that it could be the same, however because other OS's can do the same doesn't mean it's any less incredible.
I primarily use a Mac, they work well around how i expect to work so it's a personal opinion, however i use Windows at work and i have laptops and desktops at home using Windows. I use Linux more in servers but have tinkered with it on the desktop.
For me Windows 8 was better when i ignored metro on the desktop. I only use the weather app and train apps in metro as gadgets/widgets, i.e. i don't run them i just use the live tile side of it. As soon as i went down this way of think Windows 8 became by default desktops as my workflow worked.
Windows 8 has incredible performance enhancements and the reduce to idle mentality has meant big power savings, i have an old MSI U135DX netbooks, i installed an SSD 2GB RAM and Windows 8, i easily get 5 - 6 hours and the machine just flies along, something i find really incredible.
For me i would do something with the search, i find it slower than spotlight on the Mac (at indexing), so doing a search can sometimes lead to missing files as they haven't been indexed. Also i don't like the way the UI is handled, it's quite a effort, in that you perform a search and the results are displayed but there are no filters, it would have been nice if some options like, filter by all overs over 1MB, filter by this kind of document. I could type it but having it the UI would make more sense.
I would include an option to go straight to the desktop instead of straight to metro, i can understand this works for mobile devices however for desktops and laptops it doesn't work for me and would like the option.
I would have an option to change the hot areas of the screen, i really don't like the metro switcher top left as it's how i am used to closing windows application (double clicking the top left), i would also like to change the charms hot areas as well. ]
I would love Microsoft to implement the Mac's Expose feature, ive tried the third party stuff but i find it doesn't perform the same.
Generally the biggest problem with Windows 8 is the lack of choice, when transitioning away from one technology or one way of working Microsoft usually does a good of allowing people to migrate when they are ready, for example the start menu, the classic menu was there for a long time for people who liked it. I understand Microsoft wanting to push metro but on desktops and laptops they should have provided a choice, if people wanted the start menu then give it to them, warn them by Win9/10 it's going but at least have one release where people could switch between them.
In the whole regard of the Mobile UI on a desktop im afraid i still agree with the apple way which is to have one UI for desktops and one UI for mobile devices. I don't like touch on desktops and laptops as i don't think they work, i think touch is really a slate/tablet and mobile phone device type interface however this is my opinion and could easily be wrong.
However after those comments i still like Windows 8 a lot, i really like the new flat UI for the explorer shell, i think it looks very modern. I love the performance increases and the increased battery and have been recommending it to friends and family because of these benefits.