Considering that a G3 can only run Windows at the speed of a 486/50MHz (approximately), running Windows on a Mac is out of the question.
The operating system may be "simple" as some put it, but really it isn't any easier to use than Windows - the interface is
very similar! So if you know one, you can use the other.
The G3 and G4 processors are powerful, in certain areas, but just because you have a "G3" or a "G4", does not mean you will be getting 3x the framerate of someone else's 1GHz P3. In fact, you'd probably get a tenth of their framerate.
Some reasons I wouldn't buy a Mac:
1) Proprietary hardware design
2) Because of above, no upgradability
3) Plain Mac operating system
4) One button mouse unless you buy another one
5)
Small keyboards (iMac line) - very annoying
6) Very small video card support
7) Much more expensive than an equivalent PC
Reasons why I would buy a Mac: There is no reason why I would buy a Mac.
x86 based computers are at an advantage in many areas, mainly where the Mac is lacking. The thing that catches me most is the upgradability and functionality.
I can tweak things, change settings, alter anything I want. Complete control. Plus, if I want to play 3d games, I CAN. Hell, even my p83 plays UT (even if it's at 10fps, shut up, probably as fast as a G3 would play it!!

).
Take a $5000 Mac and a $5000 x86-based system as examples. Now what would you have as far as system components goes on each system?
I am willing to bet the PC ('x86' system) will have about double the hard drive space, and the hard drive will also be twice as fast. Unless the Mac gets SCSI.
The CPU on the PC will be clocked much higher and be much more overclockable. The Mac
may crack RC5 faster. SO WHAT? First of all, things like that aren't important.
There is
no reason for most people to buy a Mac - unless they are using something like Photoshop with Mac-optimized filters.
Case closed.
-RSI