I have a 7 desktop and 8 laptop. Windows 8 feels like 7, its not a new operating system. Its 7 with extra touchscreen, metro apps and multi screen features, and is very stable. I don't use apps very often, they are there for added entertainment value, and the app store isnt that that great yet anyway (not enough free indie software or quality games-will possibly develop more when the new xbox starts to use the store). As for the 8 start screen, its fine, I like sweeping to the corner using my mouse just as much as using the old 7 start menu, but I use the desktop taskbar and general desktop to launch all of my programs in 7 and 8, so having a 'metro' start screen instead of a start menu makes no difference to me.
If you prefer an old school start menu, you can always install classic menu or start8 to windows 8.
Windows 8.1 doesnt sound like a massive update. Its start menu is supposedly only a shortcut to the tiled metro start screen, so if you want an old school menu, use the programs above (classic menu is free). With 8.1, it seems that Microsoft may attempt to give customers more frequent updates. I dont mind the tiles, but it would be great if they offered themes for them, as the current rainbow lego one might not be to everyones taste XD