Kotaku - Windows 8 has its problems. Some of these are immediate, others hypothetical (and potentially graver in nature). But I'm finding, as I write this using the operating system, having been playing games using the operating system, the negativity over Microsoft's latest Windows seems a little extreme.
That's why people are iffy on it.
Performance is not an issue on my system (I5 SB @4.8GHz, 8 Gigs RAM, 2x240GB SSD, OCed GTX670) and it's stable as a rock.
I only boot my system once or twice a day and it's plenty fast on SSD already. It's going to take a whole day to reinstall all my stuff (I have LOTS of customized stuff), so shaving off maybe 20 seconds a day on booting up isn't going to make any time economical sense. Furthermore, I'm not too thrilled with the Windows 8 UI both in terms of looks and functionality, so that is going to feel like taking a big step backwards.
In short, I see no need to spend time, effort and money on Windows 8 as it currently stands. Maybe I'll go for it down the line if MS adds or makes some awesome changes to Windows 8... or if my system goes through a complete meltdown that requires reinstalling Windows anyway. If not, then I'll stick with 7 until 9 is released.