I don't know about 'hate'? How can one hate it if you have not tried it? I was running it before on a VM and it wasn't for me. However since the preview's MS did make some changes.
On my wife's machine I've grown to like it, but not much more than W7. The start page with the live tiles, cute, but these are really more 'tablet' oriented then PC/laptop/desktop. Many virtually the same you can get on an iPad or slightly different versions. Nice, but you can live without them. Skype for instance is duplicated, runs on the desktop and as a live tile.
Once you get to the desktop, it virtually is the same as W7 with some 'exceptions'. No Start Orb of course (and there are replacements for that), but I found other annoyances... Control Panel, got to find it, I now know where it is, but you do have to find it. Network Map, have NOT found that on the Network and Sharing Center yet. Many programs did not 'survive' the UPGRADE, even though the Advisor said they would. Some were recovered with a re-install, but in some games, PROGRESS was lost. Ghost, no go...
People generally go to the new OS when they get new h/w. MS has lost the 'following' that will buy the new h/W to get the new OS, they buy the OS instead.
HP, I suspect there are some new systems that will not have drivers for W7, like the Touch Screens.
Like I said, if I were to need and buy a new PC today I'd probably get W8, but the Lenovo IDEAPAD YOGA 13 sure got my attention. A PC Laptop and a tablet?