How do you feel about SharePoint? [<-- edit this Wiki page because it's easier than pointing you to a SharePoint page!] Not long ago the product was being considered a Wiki-like replacement.
My limited assessment time so far tells me I'd rather have a Wiki or a Bliki with perhaps a few small thought-out additions.
Using SharePoint results in about a 10x decrease in effectiveness for similar goals. The threshold for just ignoring a tool for me is about 2-3x decrease. I'll use SharePoint because I have to in some cases. But I am saddened that it's just there because it's from MSFT, as opposed to being there as a result of an evaluation.
Corporations don't get Wiki by and large. They're too simple to be understood in an evaluation.