One of the things that I hate most in cinema is a "message film" that utterly fails to deliver it's message and just becomes annoyingly preachy. TLW is one such movie. The message is hamfisted to the nth degree and at no point was I on Hammond and co's side.
The major problem is that you have a bunch of self-righteous hypocrites as your protagonists, who's idiocy/recklessness is CONSTANTLY getting people killed. Hell they're responsible for MOST of the deaths in that movie, and yet the film insists on painting them as being in the right. The one likeable member of the group (Eddie) gets killed off halfway through (which is also their fault btw). They seemed to have sucked all of the charm/charisma out of Ian Malcolm and Sarah Harding is a complete idiot. And the there's Nick, the character who deserved to be dino chow most of all. And yet, not only does he NOT die, the movie has the GALL to paint him as a hero for removing Pappa Postlethwaite's bullets as "heroic." Hello Steven, there's a freaking T-REX EATING PEOPLE, which is ALSO the "heroes" fault, so those bullets might have saved lives. He's not a hero, he's an imbecile who get's people killed, rant over.
And oh those eeevvvilll hunters who want to stick dinosaurs in a zoo. Yes, those monsters who saved the "heroes" backsides (after the heroes caused their camp to be trashed), shared what little supplies they had left (ALSO the "heroes" fault btw), let them come along, AND told them where the radio station was. Yes, these are truly vile people who deserved to die horribly, oh please.
Then you have flat-out stupid crap like Malcolm's daughter killing a raptor. Seriously, THREE movies with trained hunters/mercenaries wielding guns and they cannot manage to kill a dinosaur, but a teenage girl doing gymnastics can, ugh.
By contrast, JPIII was nothing more (or less) than a fun dumb B-movie with a bigger budget. Not great, but ultimately harmless, and the hypocrisy factor is drastically toned down.