Win8 by default is definitely irritating to use, but with Start8 (and Modernmix) or Classic Shell it's exactly like 7 but with unbelievable speed and efficiency. I too hated Win8 at first, believe me i avoided it like the plague. Though once i finally decided to setup a dual-boot with 7 and 8 i fell in love with the 20 second (give or take 10 seconds depending on your system) startups and better performance all around. I was also very worried it wouldn't be able to run many games (which was the main reason i kept 7 as a secondary) while in fact, not only does it run every single game that i throw at it, but it even runs the few games that wouldn't run before (it was definitely due to my oddball laptop) on pre-installed Win7. As for older games? Not a problem at all, hell it even fixes the issues with many older games i was having before. Now i can play any game, whether it's Doom, Diablo, Fallout, Crysis, The Elder Scrolls, The Witcher, Dead Space, Mass Effect, or Metro with no issues, lag (other than that due to my relatively low-end system).
So in conclusion: If you don't like the new interface....actually, forget the "if". Though you hate the new interface offered by Windows 8, it does not have to be used at all (with the exception of customizing the new features like your lock screen image) if you get a program to return the start menu and button that we all know and love (i've used both Classic Shell and Start8, i prefer Start8 but Classic Shell does have nice customization options).
Side notes: Before i switched to 8 (which to be honest, i did out of curiosity more than anything) i could not play certain games on my system, either very well or not at all. Mass Effect 1 and 2 (3 ran fine) would crash whenever i would pause the game, they were simply impossible to play without access to the menus. Now with Windows 8 they run perfectly (great framerate too). I also had issues with a little game know as Cortex Command, which had a graphical glitch (black screen) whenever i went into fullscreen mode. It's fine now. Steam used to be extremely slow and unstable (it crashed alot), but now it runs smoothly and has only slowed down a few times (it has yet to crash).
Other thoughts: Many people interested in Windows 8 are gamers, because as soon as a gamer hears the words "better performance" they get interested pretty damn fast. Some people seem to want Windows 7 to be updated with Windows 8's performance, but honestly, Windows 8 (with Start8/Classic Shell of course) IS Windows 7 with better performance. Win8 was built on Win7 and not too much has been changed that didn't need to be to get the better performance and stability (except the interface of course). Also, the traditional Win7/vista/xp interface is still there, you can go to the desktop and use it like a normal Windows experience (except the part where you need to get there). Of course with Start8/Classic Shell you'll start right at the desktop and never even have to use the Metro UI. I know it's hard, but Windows 8 (with Start8/Classic Shell) is in every way possible better than 7. There's no argument to make that would prove otherwise, there's nothing missing from 8, there's nothing out of the ordinary with how you go about your normal desktop activities, and there's nothing even significantly different (with the exception of a few programs like (file)Explorer, but trust me, they're good little changes) about it at all. Argue with it all you want, but I use Windows 8 everyday now and I couldn't be happier with it. In fact, it pains me when i have to go back into 7 to use an old program (which i can't find to install again on 8) because of how slow it is in comparison.
Also: If you haven't figured it out by now, all this is about Windows 8 *with* Start8/Classic Shell. Without one of those programs it does suck to use.