I spoke to movie-goers about why some of them don't like Shin Gojira. The simple answer is: not enough actions, many things happened off-screen or intentionally left unexplained. You even need to cooked-up theory to explain what exactly happened in it.
Why? Why it need to be so enigmatic? Why no 20X Goji-stomping like we used to see in '90s? IMO it's the budget. In order to create modern disaster movie or giant monster movie, you need huge budget like Marvel's because you need your characters to see things happened IN PERSON. That's what this movie lacked.
For easier explanation, let's imagine Godzilla 2014 (G2014), but only a view from Dr. Serizawa and Military Commander speaking, planning, arguing about their plans to get rid of Godzilla and MUTOs, with NO view from Lt.Ford and his wife. Now THAT's Shin Gojira (G2016). Not saying G2016 is bad though, I LOVE G2016 but why they're choosing this route of a movie, without saying about the director's political view is so obvious IMO.
If Toho has more budget, the characters in Shin Gojira 2016 could've been (1) an ordinary guy who saw Shin Goji's carnage IN PERSON and ended up being one of Yashiori operation member. (2) his son who lost in the crowd, wandering from bunker to bunker and finally met his dad at Tokyo Station and (3) Rando Yaguchi, a civil-servant and his teams.
But of course, if Toho went G2014's or even ol' Gojira 1954's routes, this gem of a political satire will not existed though.
Still, I want Toho to release Shin Gojira novel with stories like I mentioned above! At least they'll get my money lol.
Edit: rewrite my post.