My only real downside is that I'm having a heck of a time with some of the dokuwiki css but you mentioned that this might be the case in your install notes. That's really just a small hurdle. The css glitches aren't likely to even be noticable by any of my users so in reality this is a non-issue.
I really like the markup syntax. It's very clear. Not having to use camelcase is good. Having the option to enable html is nice. Having a simple button bar with the most common syntax is a godsend for those not familiar with wiki markup.
Page removal took me a bit of reading on the dokuwiki site to figure out (edit the page and delete all content). But that turned into a nice adventure where I learned a lot about other features you can add or that have been added that aren't totally obvious. They have a nice little community over there!
I never could get the other wiki implementations to work very well. As such, I must admit that I started this install with very low expectations.... I was delighted to find however that this dokuwiki integration grabbed most of my css and was working right out of the box in a matter of minutes. If I didn't know better, I'd think this was a native XOOPS module given its ease of integration.
Three thumbs up!