Re the site itself, I think it's a good idea but I agree with the meta-scoring. Add a point system that levels you up both by writing a review and later by reviewing reviews of the same site/commenting on them. The higher your level or the more points you have, the more your sites will be reviewed.
And please make https sites fail more elegantly. It's okay that you can't load them in an iframe, but make it look less broken. I submitted an https site and I doubt many people will review it when they are met with a huge screen saying "http only" through no fault of their own. Instead say "This site is using https (learn more), please click here to open the site in a new tab"