OK so now I've tried Windows 8 (the final release), I think I can put my views forward:
It's better than XP and possibly Vista in my opinion, but I still prefer 7. I just can't really get used to the Metro UI and the lack of aero annoys me. The lack of aero makes the OS look a bit ugly in my opinion.
I tried out several programs which restore the start menu & button - they all have their problems. :/
Overall the OS is decent but it has a few things which annoy me. I wish you could turn off all the tablet stuff, for example, when you mouse hover over the right side of the screen a menu comes up with a 'home' button and a 'back' button etc (a bit like what you get on tablets), and when you put a disc in your DVD drive it says 'tap to select what to do'. I don't like that. I also wish you could turn off the Metro UI.