Like SenZar, World of Synnibar is over maligned. Some people have harshed on it because of it's creatur's past antics. Others pick on it because it doesn't match their play style. Don't get me wrong, it has it's mechanical flaws, but it also has several great points. To wit:
Excellent XP mechanics that reward capturing the bad guys and rescuing prisoners more than killing orcs.
Great range of nifty classes and abilities.
Setting built for adventuring.
Great for crunchy beat-the-system/beat-the-GM style hackery.
Fun kitchen sink approach: you can play a ninja or a cyborg or a wizard or a mutant.
The GM has as much on the line as the players when running the game.
For further info on Synnibarr, read my old blog entry on the subject: