I gave it a 2 rating because of the following problem.
The plugin erases the standard featured image on update. If you don't have an external link then no image shows up at all! This is not a bug, but an over site that should be addressed. Perhaps a checkbox to use external image (default unchecked) so that if you update a page with a regular featured image set is does not interfere with that.
Anyway, it should be corrected.
If this is corrected I would give it a 5!