The first act and set up was brilliant. Absolutely brilliant. The throwback nods and scene setting were brilliant, the park was brilliant, and in that first act I basically didn't stop feeling about seven years old. Also, I liked that, as Skippy said, almost immediately dispelled any fears about the Raptor squad by establishing that they were barely controlled, and Pratt's tenuous role as the 'Alpha' of the pack means that they are far from pets and still a hair-width away from being the killing machines they were in JP1.
Then the second act starts and there's about twenty minutes where they're establishing the 'science' behind why the gooseberry fool is hitting the fan and I nearly had my head in my hands over how strawberry floating stupid it was. Like, the entire first film is predicated on the idea that repairing the dino DNA with other animals had unforeseen side effects. So when they're like 'why can it camouflage?' 'Oh because we gave it *insert bullshit here* DNA for reasons and didn't think about it'. REALLY? You didn't think about it despite that exact bullshit being the WHOLE POINT OF THE FIRST FILM? I KNOW YOU KNOW THAT DR WU BECAUSE YOU WERE strawberry floating THERE! DON'T YOU RUN AWAY FROM THIS WITH YOUR SUITCASE FULL OF SEQUEL COME BACK HERE YOU SON OF A BITCH.
Also, the whole sequence where the Big Bad escapes was retarded. It being able to hide it's heat signature was silly enough, but they decided to all go into the cage to check out the decoy and only *then* ask to check the strawberry floating location chip (surprise surprise, it's still in there with them). REALLY? YOU DIDN'T THINK TO CHECK THE LOCATION CHIP strawberry floating FIRST? REALLY? I would have thought that the sequence would go 'Hmm, this horrible crazy mutant dinosaur appears to not be in the pen' - "Check the strawberry floating island-wide location chip right a-fucking way", not 'It's missing - let's go into the dense jungle with the blocked entrances - check the tag - ohshithesbehindusyoucannotbeseriousomg'.
And don't get me started on how, during a site-wide emergency evacuation, the brother's strawberry floating VIP wristbands allow them to over-ride the controls and drive through the strawberry floating DO NOT ENTER gate.
But then, after that twenty minutes of silly strawberry floating bullshit, it gets good again. The attack on Main Street was really fun and genuinely panicky, and the move into the final act is ace. The final fight is okay, mainly because I'm on the fence about smart dinosaurs. I don't find them as compelling as the hunter-elites in the first film. But if you can swallow smart dinosaurs then it's fun enough.
That strawberry floating look between the T-Rex and Raptor at the end, looking like McClane and Al at the end of Die Hard had me in stitches though.
Overall, I did really enjoy it, but you do have to swallow a lot of bullshit to stay on the ride.