sorry to hear that and sorry to say this, but I think that having wrong server configuration and being not able to fix it is not reason of giving bad review.
It is not just for nerds, both of the problems you describe are well explained in FAQs, including solutions. Did you read it at all?!
About 500 Internal server error: http://www.artio.net/faqs/artio-joomsef/troubleshooting/500-internal-server-error-after-installing-the-component
About 404 Page not found: http://www.artio.net/faqs/artio-joomsef/troubleshooting/404-page-not-found-error-after-clicking-any-link