G5 versus x86 / OS X versus Linux

the G5 has never been as amazing as the G4. the g4 at the time was 3 times faster than it's pentium counterpart, it was the first home computer to be classed as a weapon under US military law etc... the G5... isnt. at best it's as good as it's x86 counterparts....
If you have some Linux experience, you should not be surprized. The low-level applications run far better on Linux than on any complex OS (MacOS or Widnows). But the Linux GUI is also simplified and maintenance is still much more complex for home users.