I also wonder why people couldn't see that this is the only free extension that can bridge Joomla with a WordPress.com blog. WordPress doesn't share your blog's back-end database connection details so every other extension available is unusable at the moment.
Please, have a look at https://github.com/cognidox/WordBridge/wiki to understand the extension better. There's a video tutorial as well.
+ Simple to install. Easy to use.
+ Supports caching of blog posts. Time out can be configured.
- The extension is dependent on what API is exposed by WordPress.com to the developers so it isn't likely to have too many features (like support for comments, like buttons etc.)
- No support for pagination. Number of posts to display needs to be changed in your blog's settings.
It's a work in progress still very stable and quite usable if you keep your expectations in check.
I think the developers are definitely busy adding bells and whistles and the extension would get better with time but subject to WordPress API limitations.
I'll rate this 4/5 but I'm giving 5 stars to offset some of the (in my opinion) unfair reviews.