You have competitors, and they are significantly easier to use. Probably the most common use for a slideshow is just a slideshow of all of the images attached to a post. Make it dead simple to do this, and you will be much better off!
I ended up having to make my own shortcode and then wade through your source code to figure out why your shortcode wouldn't nest with it. For those in the same boat, line 46 of ./lib/core/class-wunderslider-shortcodes.php removes all shortcodes from the rest of the plugin, so you must re-add your shortcode there. Also, you must add
$content = do_shortcode( $content );
to line ~91 to re-enable nesting.
I also found it hard to understand your installation documents that you reference to in the 'Installation' link of the plugin here hard to locate and then hard to understand. My main question I found myself asking was where to place what in my FTP server (as I was instructed to skip straight to the wordpress section, which doesn't cover that well).
Finally, because you use non-standard html as markup for the plugin, wordpress automatically kills any markup one has written when you go back to the visual editor. This isn't necessarily your fault, as there are TONS of threads complaining about it, but I would think you could implement this using standard html elements like many other sliders have. For those trying to get around this limitation, I ended up using an unofficial plugin from http://www.binh.name/less-filter-plugin-for-wordpress/ which still works. I hope this plugin doesn't introduce any security concerns, as it stops filtering from happening in the post input fields, and the author wasn't very clear on if it overflows into public inputs or not.
Anyway, I like what you're doing here. Once everything is all set up and customized, it's a pretty capable plugin. Just have to add some polish to make it worth it. Thanks for your effort!