I read nearly every review Ebert wrote during my lifetime, some of them repeatedly. I was a weird kid. Ebert loved Prometheus specifically for its ideas and themes. I think he would have docked points for obvious backtracking from the bolder ideas, for killing off a character that he liked is an unfair way, and because he found the repeated beats boring. I imagine 3-3 1/2 stars from Ebert, at most. But I'm happy that Seitz loved Covenant. Good sign.