Sorry to hear you’re unhappy with the plugin. The AMP plugin allows users to continue using their existing WordPress theme and plugins the regular WordPress way via transitional and standard mode, as opposed to various options for just the AMP version of their site. This makes it more achievable to benefit from a fully AMP valid site while maintaining your themes appearance.
In relation to the lack of support we’ve done our best to answer your previous support topics and are happy to continue to do so. We value your feedback and will take on board your comments as we work on building a new website. Our existing website features documentation on how the plugin works.
If you’re interested in giving the plugin another try or wish to test out the release candidate of version 2 of the plugin there is also a setup wizard explaining how it works. As a user of the plugin for a while we’d love to hear your feedback and hopefully address any concerns you might have?