Everyone complains about the new Metro interface. I've been running Win8 preview for a while now and while I've adapted to the new interface, it does still bugs me. But complaining about it is like arguing about KDE vs Gnome; you can castrate the Metro interface to look like Win7 with 3rd party software. What really matters is the kernel. It may break some applications and for those people Win8 is a bad choice. But from my experience, the new kernel is runs better than Win7 (which is saying a lot given how much better 7 was than Vista). Several games I tested got a nice frame-per-second boost (or at least performed equally) under Win8 vs Win7. So for me it's worth it to upgrade but I suppose your mileage may vary and as benchmarks come out we can see more about how the kernel performs on different systems.