I don't care how critical your review of BvS would be, at least you would have watched it. I could respect your opinion at that point. No matter what you say to rationalize and defend your position here, the song remains the same - You haven't seen BvS. To critique it in ways that imply you have, or putting it in rank with a bunch of other films that you have seen, is disingenuous. You should just put a disclaimer at the top of your review saying "I HAVE NOT SEEN BVS BUT I KNOW A LOT ABOUT IT FROM REVIEWS, YOUTUBE CLIPS, WIKIPEDIA, AND OTHER PEOPLES OPINIONS". As ridiculous as it is, that's literally what you're doing. At least at that point though, people would understand that the review isn't coming from a fully informed and objective perspective.
But, hey, it's your blog. I just don't understand how you could expect people to take your opinion seriously in matters like this when you aren't even trying to be sincere in the review.