I think it was well described without all the harsh words.
Dont blow a fuse Sparky.
Another way to look at it is whether the Console being emulated is well documented. Infact, thats they key to it all.
Why is SNES emulated so well? I can tell you it has nothing to do with CPU power. The SNES was simply very well documented, therefore the authors of Snes9x, ZSNES, and NESTER had alot of detailed information in regards to how it works.
The Dreamcast was not well documented, and the only known emulator (Icarus) has been private for years. You'll need a 2 ghz pc just to get 15FPS on it.