Remember, guys, Angry Joe liked Terminator: Genysis. And Suicide Squad.
The point is, people in the same larger fandom of any series will like and hate different films. It's inevitable. I like the Terminator series, for example, and I liked Genysis in spots. It's not the best film in the series, but it's not the worst. So I can understand why Joe likes it, and why someone might not like it. Hell, I understand why people wouldn't like Alien or Aliens.
I think I probably get why Joe, here, dislikes Covenant: It's not what he wanted it to be. That's it. It's full of "stupid" things that, to him, don't make any sense. But look at the guy's props and costumes. He's a full-blown fan. So much room to disappoint someone who carries all that kind of expectation around with him.