There are plenty of things that are new. When we go into them, people say 'I don't really need that, therefore I will choose to go with Windows 7' even though Classic Shell turns Windows 8 into Windows 7 while keeping all those features "you don't really need."
If you don't need a Windows 8 feature than that is an argument not to
upgrade to Windows 8, not an argument against Windows 8
from scratch, which, with a 30 second install of this
http://sourceforge.net/projects/classicshell/files/
becomes Windows 7-looking Windows 8.
So why go with Windows 8:
1. Classic Shell kills metro in 30 seconds - there goes the only reason I know of for most people NOT TO GO with Windows 8.
2. Whoever inherits your system gets extra three years of Windows updates. Win8 end of life will be longer than Win7.
3. Mostly small stuff such as ability to pause/continue copy-paste operations. Somewhat snappier performance. We can go into what that means, and if we can demonstrate that Windows 8 does boot faster (even if it is only a couple of seconds faster than Windows 7), and we can demonstrate that on a completely equal dual-boot system, people then say "well what's a few seconds, I don't care."
Well then install Windows 7 from scratch and wait an extra second or two for your system to load and be happy like that. The rational question should be "what do I loose by installing Windows 8".
You loose A LOT IF you are not computer literate to install and configure Classic Shell freeware, because Metro is a nightmare and Windows 8 Charms is definitely a nightmare, popping up every time you move your mouse. But Classic Shell kills both (well not kills, disables until you choose to use them), and so if you spend 30 seconds to install Classic Shell, then you gain all the other small things.
Once again, we can go into what RAM and CPU usage advantages are, multi-monitor advantages, future touch screen application advantages, lost of other stuff people say they "don't really need' but why would I go and install Windows 7 from scratch when maybe in the future I may want to check out a Metro App? Classic Shell makes Windows 8 look like Windows 7 and with a simple SHIFT+CLICK on the Start Menu, I get the OPTION (just the option) of Metro. Why give that up, why not have the option if there is no downside?
The downside would be if you
abandoned Windows 7 to UPGRADE, do not do that, but from scratch? Go with Windows 8 and if not, then why not?