I have yet to pick this up, but I love JP. Think the second is...okay, but it certainly has a couple great sequences.
But I hated the third. It's been 10 years since I saw it, but what absolutely sticks out in my mind (aside from the fact that the action scenes seem to always take place in the sunlight and the cell phone inside a dino's stomach), was how they disrespected the T-Rex.
I'm bias in this obviously, but when I think of dinosaurs, I think of the T-Rex. And I hated how they killed him off and featured some other odd looking dinosaur most people have never heard of.
It felt like watching "King Kong" without a silver back Gorilla. Hated it.