On the whole, it's a pretty worthy successor to the previous 4: Basically, if you enjoyed them, you'll enjoy this one. And there are elements in this that suggest there could be better follow-ups to come.
The premise for this Fallen Kingdom is that the dinosaurs still living on the island where the first Jurassic World took place (Isla Nublar), are under threat from it's volcano. An unlikely rescue mission to save those inhabitants is mounted...
The early star of this film is the volcano. There are some spectacular sequences, some hairy moments for the main characters, and a truly moving bit involving the dinosaurs. You'll know it when you see it.
So much for that half of the film covered by the trailers. The second half is very different: Exactly what do you do with a bunch of rescued dinosaurs? The answer to that shapes the remainder of the film.
I'll avoid spoilers by not covering that part of the film, but it looks like the movie studio is paving the way for some sequels. I can see at least 3 completely different directions they could go in. Two of them I'd love to see, but the third, and most likely to be chosen, would end my interest I have in the series - It would be exploiting the very aspects of the first Jurassic World film I hated.
Sorry to be so mysterious, but I don't want to spoil it for those who have to see it.
Rating: 7.5/10