I thoroughly enjoyed the first two Jurassic worlds, the plots made sense for both of them, and I did enjoy this movie too, I did enjoy the meshing together of many scenes, but, (and this could change over time but for now this is my honest perception) I felt some things could have been done differently.
I do feel some parts were rushed while some parts weren't rushed. it seems like there was a desperate desire to keep it just under two and a half hours, where it really should have been the 3 hours that most of us hoped it would be. I'm no movie plot expert by any stretch of the imagination but this is my take on it:
Certainly if they actually went with the plot that the first two Jurassic Worlds led us to believe would be the plot (the weaponizing of dinosaurs for war), then not only would we have gotten the whole 3 hours, but it would have opened pathways to include more in the movie, especially the spinosaurus that we all really should have seen.
I'm really not sure why the creators felt like they could not have two antagonists, Justice League Dark Apokolips War did this and nailed it, it was insane when Trigon came out and we then had to figure out what was going to happen now that two independent supervillains were in the mix.
The locusts could have played some part of the mix, but The Giga and Spino would have been Biosyn's "Big Guns" They could have brought in one of the other rexes from site B, they could have teamed up against the Spino and Giga, or each of those rexes could fight one of the antagonists each in different areas, or the Spino could have been brought in last minute as a last resort after the Giga would fall to the rex, and then the other rex would come in and help, something, there were ways to make it happen.
The fact that we got that cheap Spinoraptor appearance in the underground cave was not only proof that they could have fit it in somehow, but, further, it was almost like a big tease to the fans, a "haha you're not getting what you want." Call me overly bitter for saying that, but man would it be so bad to have left us with the impression that in some cases the spinosaurus could win and in some other cases the T-Rex could win, even paleontologists will say things like that when they predict which apex carnivores would win over the other.
So it can be said that this movie was put together well in its own way in its own direction that was decided upon to move with, but overall I thought Jurassic world 1 and 2 were better, especially the endings. In Dominion, the character stuff was done fairly well, the dino stuff was done pretty well too, it was just the plot and the missing additions... just wanted to get my input out there, I'm interested to hear any similar or different opinions.