How do you review Windows 8? Last I checked, it’s not even out yet (excluding 99% baked RTM bits).
You would need: a desktop, a laptop (with and without a real trackpad) and a tablet with Windows 8 and Windows RT (which is Windows 8 without Desktop support).
If you don’t review on those things, you’re missing part of the story of Windows 8. They all matter. I can only testify for two of those items: desktop and laptop (without a real trackpad). It’s not that great, but it’s not that bad. It’s not like, “Wow! This new Windows is so fantastic!” in the vein of Windows 7, but it’s not terrible like, “Ugh, my seven year old hardware is apparently not cut out for this new Windows…”.