The most useful feature it has is Favorites, but theyre tucked away and not easy to access. You have to make two clicks just to see them and they open in an overlay instead of a side panel, so you cant see your favorites and navigate articles at the same time. There doesnt appear to be a hotkey to bring favorites up either.
You can easily switch languages, which is a nice touch, but not a feature you will likely use often. Despite this, the feature is very prominently displayed in the menu bar and sidebar where favorites ought to be.
Pictures and diagrams sometimes take a long time to load because it loads all of the images at once into an image browser. The browser is nice, but when youre doing research, I feel that loading diagrams and images quickly would be more useful than being able to rotate and slideshow them.
I would like to see what Wikibot can become, because at the moment I dont think it takes enough advantage of the fact that its a specialized local application. They could have multiple panels for cross-referencing articles, more hotkeys, trackpad gestures, and maybe an add-on to the Mac OS X Services menu. The developer could have taken more care in the choice and design of features.