I'd give Jurassic world a 6/10 only because of the great effects.
The plot has already been eviscerated on here, so I'll go after the characters. Absolutely awful. I kept hoping the annoying little punk with the mophead would get eaten because I was really sick of his crap. It's like the director said "your role is to act really, really excited at all the cool stuff", and damn, did that brat deliver.
Every single character was a complete cliché. Amazing, really, that not one of them varied from that even a little bit.
It was really a lot closer to a reboot than a sequel. You could line up the characters in this one and quite easily switch them off with their counterparts from the original. The male lead who is suspicious that things aren't right, a budding romance with a woman, two kids who get lost and attacked by dinosaurs, the good-hearted owner who doesn't realize the problems with his creation, the dark-haired geeky guy providing cryptic warnings about fiddling with nature, the inside traitor guy, etc..
To me, it was exactly like watching the original (which was a great summer movie), only with less competent actors (except for the Indian guy), and absolutely no sense of wonder. But the excitement and cool dinosaurs were there, so it's a decent popcorn flick.