I believe that Wiki Creole is going to be a grand failure. Which is a shame, because from what I know of them, I like a lot of the people involved and I want to see people enthused by wiki-projects.
But they've set themselves a hard problem. Glancing at the current discussions it looks like they've already tied themselves in knots : eg. using * for bold and list items - and then having to go back and change their minds, and then changing them again.
I don't like the Creole syntax at all. Probably for stupid, selfish and ideosyncratic reasons.
But these are the kind of reasons that count.