There is no ideal sermons plugin for WordPress. The plugins that exist now are either unattractive in appearance, lacking features, buggy and unsupported or don’t work with all the WordPress themes that are available. This is what I’ve observed and this is what I’ve been told by people over the years. The sermon WordPress plugins available now are not useless, but they are not ideal. Churches using WordPress deserve a sermons plugin that meshes perfectly with their theme, that is easy to use and that does everything they need.
We are working on such a plugin and it is called WP Sermons. This is our vision for it.