I'll start out with things I liked or outright loved.
I liked the introduction of the park in general. The JP gate was a nice throwback to the original movie, and the island itself looks gorgous, with a bunch of establishing shots. We're introduced to the Raptors fairly early on, and immidiately, one of my biggest concerns with the movie is addressed. I was really worried the Raptors were going to be less threatening in this movie, do to them being trained and such, but the movie actually pulls it off nicely. Explaining how they've been trained from birth, and how they clearly still show a lot of aggressive and strong willed behavior. I thought they are were genuinley terrifying in that first scene. Pratt did nicely in the first scene, and maintains good screen presence throughout the movie.
The hybrid dinosaurer, known as the Indominus Rex, is also introduced quite early, and while I'm still not very fond of the idea that a hybrid was needed, the movie does at least give an adequate explanation for its existance. It also looks pretty neat, although the head is perhaps a bit too similiar to the Spino in JP3. Furthermore, I quite liked the various features it had, such as the ability to camouflage. This too was explained fairly well.
The breakout scene itself is okay, although I had problems with two things in particular.
First off, how could this thing possibly construct such an elaborate escape plan? Scratching the wall to make it look like it climbed over it, while the camouflage it's IR signature, is just plain silly. I don't buy it for even a second. I also find it hard to believe that Pratt and the gang would't have questioned how no one saw or heard a massive dino climbing over the wall, and falling down on the other side, considering this place was seeminly undergoing continued construction, and I assume they'd have guards standing by as well, given the ongoing work, and the fact that they were dealing with something completely new.
Its rampage throughout the island is quite well done however, and I like the idea of it figuring out its place in the foodchain. The encounter between the Indominus and the first security team, is pretty awesome, even if I question the idea of not bringing perhaps a 50/50 ratio of lethal/non-lethal weapons.
I absolutely loved the kids and their super nostalgic moment at the old park's visitor center. The Jeep Wrangler has a very nice cameo, even if I'm a bit sad its screen time is so limited. Would've loved a chase scene with it.
Once everyone get back to the park, the movie starts falling apart for me...
The flying dinos and their attack on the visitors was super generic, and even worse is that after a while, the flying dinos simply disappear. Seriously? You have 'em being a massive threat for a little while, and then the screenwriters just forgot about them? Where the hell did they go? The scene with the assistant seemed completely forced, but hey, who gives a damn anyway, right? It's not like we get to know her at all...
And that's another major problem in the movie. In the original, 5 people die, 1 of which is off screen. Every death was memorable, and had at least some degree of investment from the viewer. In Jurassic World, you don't give a damn about anyone who dies. The various security guys, be they from InGen or park secuirty, have zero personality, and just serve as dino fodder. Same goes for the park visitors and the assistant. None of them receive any character development, so why should we care? You could argue that the first person to die in the original also didn't receive any character building, but his scene was detailed and long enough for us to care about his survival. In JW, everyone dies so damn quick, that it's hard to give a damn.
And did this movie really need a genuine cartoonish villain? I don't remember his name, but every time he opened his mouth, I wanted someone to hit him. Such a frustraiting character, who's only purpose in the movie is to set up the next one, and to be a dick.
You'd also think that the fact that almost 20.000 visitors were on the island, would factor into the endgame. But no. After the attack of the flying dinos, they are barely ever seen or heard from again. They're left to chill inside the visitor center, leaving our protagonists to fight it out, alongside pointless InGen dino fodder. What a waste...
Then comes the showdown between Pratt, his Raptors, and the Indomines. At first, I actually thought it was a cool plots twist that the Indomines was part Raptor, and as such, was percieved as the Alpha. But this was the followed by an incomprehensible and short battle between InGen personnal, and the Raptors. Gotta save on that effects budget, and make such the rating stays at PG13, I guess... Who cares if it hurts the quality of the movie...
The final fight between the Indomines, and the Raptor/T-Rex was such complete bull, I don't even know how to describe it. It was halfasses, the CGI wasn't that good, and ultimately, the Indomines suddenly didn't seem like such a huge threat.
Ultimately, the pratical effects in the original, were better than the CGI in JW.
The character deaths mattered in the original, and don't in JW.
Aside from that first scene with the Raptors, the dinosaurs were far more menacing in the orignal, than they are in Jurassic World.
I will probably pick it up on Blu-Ray once it releases, but I do think they could have done a lot better than they did.