Andrew,
Alejandro at JReviews has been in contact with us recently. JReviews is including the 'old' Facebook Javascript file on it's pages, which can cause conflicts with both JFBConnect and JReviews. It sounds like an update is planned soon for that, which should help with the auto-post feature. You may want to contact them about that, as he should know more.
As for the image and text to use, can you tell me:
1) A page with the incorrect Open Graph tags?
2) Are the Open Graph - Content or Open Graph - JReviews plugins are enabled?
3) What are you expecting the description text to be?
Finally, for general EasyBlog and JReviews setup, can you let me know what other stumbling blocks you're running into? We'll gladly help however we can once we understand where you're at.
Thanks,
Alex