Inb4 TLDR: summary is JW sucked, here's why I think so.
Admittedly, I have not seen the original in a long time; probably will do so shortly just to validate my feelings on this. I wouldn't say I'm a fanboy, but the first film changed my life in 93, and I did read the books in some formative years.
However, I think the Jurassic Park films jumped the shark and became distinctly "popcorn" films when Trex rampaged through San Diego in the Lost World. At that point, they started to go for simple entertainment, poorly written movies sprinkled with nyuks and special effects. Importantly, that's where the movies completely departed from the novels' source material as well.
The first film had the awe factor that will never be reproduced in a sequel. But because the special effects were combined CGI and conventional effects, they still hold up remarkably well and give the film a 'pass' I the top-much-CGI sniff test. JW, not so much.
The tone of JP was almost of a horror movie the way suspense built up (the water cup scene in Trex's approach); everything seemed plausible and characters were more interesting and you could care for them enough to not want the to die. Plus they actually did things that made sense i.e. Running like hell to shelter instead of standing out in the open (maybe kissing in a limp effort to force a love story subplot) watching dinos with inexplicable irreverence.
Death of characters is just treated with no respect in JW. The pterodactyls swooping down on hoards of people? Soldiers' heart monitors dropping offline left & right?
I could go on (lead lady running in heels the whole movie) with pointing out the idiotic choices in the movie that brought me down.
In summary, they're making tons of money on these movies so there will be no end to this drivel until, just like Bond and Batman, people decide they're tired of the mindless, contrived "popcorn" movie garbage they've seen a hundred times & they'll reboot the series with a more serious effort matching the original movie (and novels') tone & depth. When that happens, I'll go see another Jurassic Park movie. But not until then.
I still think a good film could be made by actually following the book's plot for the Lost World, as Spielberg & co hardly followed anything written in Chricton's excellent sequel.
So that's why I hated JW. Flame away.