I use Windows 7 at work and Windows 8 at home. I may be in the minority, but I like Win8. The biggest problem I see with Win8 is it is not really "discoverable" like Win7, or even WinXP. I tend to be a heavy keyboard user and because of that there is not much of a difference between 7 and 8 for my usage pattern. For example, I normally press the Windows Key, start typing the program I want (e.g., word) and press Enter. That starts the program in either 7 or 8.
If you are not familiar with Win7 you will be frustrated with how MS moved stuff around. This applies to the control panel, printers, my computer, etc. MS moved things around in Win8 too.
Win8 is better than Win7 if you use multiple monitors. Win8 is better if you have a touch screen. With a mouse, it takes a little getting used to.
Win8 doesn't have a start button. The edges and corners are very important in Win8. If you move to Win8, I strongly suggesting finding and watching a training video. It will save you a lot of frustration.
Win8 has two modes, desktop and "metro." Desktop mode is much like WinXP and Win7. Metro, or Windows 8 as Microsoft calls it, is a tiled, full screen interface. The tiles represent the apps. Clicking a tile starts the app. It is full screened and it doesn't have the traditional buttons in the upper right corner. If you want to close an app you click on the top of the screen and drag down.
If you are considering Win8 I'd suggest going to a Best Buy, Sam's, Costco, etc. and play with one of the computers, but be sure to only use the keyboard and mouse since that is probably the configuration you have at home.