Each to their own. I originally presumed the hate for 8 was a knee-jerk reaction to a differing design language and microsoft in general, until I got a machine that shipped with it. Then I was flabbergasted IRT how unpleasant it really was, and I say that as someone who has used windows since v3 and is not resistant to change.
Metro (or modern UI as they call it after being sued) makes sense on a touch screen. It makes no sense whatsoever if you’re using a mouse because your cursor is having to travel such long distances compared to normal. I know that sounds idiotic but it really depends on the way you use your machine… As an indication of how truly inefficient mouse movement is, if I didn’t memorise the key commands for adobe CS programs I would be at least 10% slower in churning out graphics. Opening files in Modern UI mode by default is totally stupid - particularly if you’ve opened them from the classic desktop view. They also reversed the clickwheel’s scrolling direction for no apparent reason. I know it’s supposed to reflect the touch experience on a tablet but it’s dumb IMO because it’s not a screen… it’s a mouse that already has a UI language.
I like the old start menu. It made total sense. Adding back the half-assed start menu in 8.1 is both an admission of the error and also not enough. After installing Start8 I was happy because I had a Win8 machine that worked like a Win7 machine.