I would give it a solid 8/10 for what it is. It's a monster movie. People on here nitpicking things. It was fun in the cinema.
It's not supposed to have an overly complicated deep story. Yes, some parts where the tribes get's involved get's a bit corny, also the over the top comedy as well but what can be more corny than monsters fighting eachother.
It will go based on expectations, I expected mindless monster vs monster fights and it was exactly that. Good time.
Obviously a lot of things could have been better but movies nowadays are all the same, they never have enough time to really develop a storyline. Villain was weak, not enough Godzilla in the whole film, things happens fast and it's predictable but who cares lol its a monster movie.