You can also use ViStart. It's free software but it requires .NET Framework 3.5. It looks like Win7 startmenu. Sometimes, it can crash (a small error when Windows is shutting down).
If you want to try ViStart, when installing, don't accept extras (it's adware).
With startmenu and another theme (default theme in RTM is ugly, you can use RP theme in RTM if you want), Windows 8 is not bad: it's stable and has good performances (quick at boot,...).