Fun movie. Hearkens back to the old monster movies from before even I was born (and I was born a long time ago).
Jurassic World: Fallen Kingdom (2018)
Like Rampage but more serious but, yet, not a wholly serious movie. Fun still takes priority.
I'm not saying the stories are anything alike. The stories are nothing alike. It's the general feeling about each movie that I'm asserting.
Now, Rampage is inspired by an old arcade video game of the same name (that existed before some of you were born, even). Knowledge of the arcade game is immaterial. There is fan service thrown in late in the movie for those who know, but we also realize that the Rampage game had no story and, ultimately, no point. We know full well that there's no way to make a movie out of the game. Even without any knowledge of the arcade game, the movie still accomplishes its obvious goal with its own story.
So take it for what it is: a throwback to the old monster movies with an homage to an old arcade game (which itself was an homage to old monster movies). For that, it does it well.
Fallen Kingdom might have a special marketing agenda, but without spoilers, I cannot say more. It involves the ending, specifically.