Don't know why people moan about the Metro screen so much, you don't have to use it and apart from that it's the only real major thing that is different between 7 and 8. Personally, I like it, you can pin all your shortcuts to it and it takes less than a second to switch to it and load your program/game, or to switch to it and back to the desktop.
There are other minor changes but nothing you won't adapt to in minuets if you go from 7 to 8. Everything else is basically the same, what you did on Windows 7 you do it the same way on 8, as for app and game incompatibility, the list is very small.
Even if you come across something that won't work there is compatibility mode which will run the program under Windows 7/XP requirements, if it still doesn't work then it's either an old program and there is a newer better alternative or you are very unlucky.
As for performance and functionality Windows 8 is much smoother and faster than 7, if you don't already own 7 and can get 8 for the same price, or even if it's a bit more expensive, 8 is the way to go.
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