The movie does not take itself seriously, and that is a huge plus point. But the fun parts of the movie makes us forget them, at least till the movie ends.
The movie uses time tested cliche - Four teenagers with some flaw realize their shortcomings when (literally) seen from some other's point of view. There are enough plot holes like how did the video game end up in a high school from Alex's freak house. Here they discover the Jumanji video game and enter the world of Jumanji as their avatars. Four teenagers with varying personalities are put together in a detention. Jumanji gets a modern age makeover where now instead of a board game it is a video game. But much like Spiderman: Homecoming, Jumanji succeeds to impress the viewers. Last couple of years saw such horrible reboots like Jurassic World, The Mummy, Kong: Skull Island. While some click, most of them crumble under the pressure to shake off the barrage of comparisons that would be thrown at the movie.