
So... In short, it wasn't a bad film but it wasn't a good film. We had a particularly obnoxious audience of mostly teens who all felt they needed to outperform one another and the film by screaming, squealing, shouting, booing, etc the movie as much as possible. I wouldn't have minded if they had been enthused but the tone was more of one-upmanship than excitement.
The plot is the same as the other films in the series. Real world sucks. Harry almost doesn't get to go to school. Some big name 'rescues' him from mortal world. Rides some enchanted vehicle. First semester is reasonably light, getting more dark. Stuff that could get him kicked from school. Lonely sad unhappy christmas. Afterwards, things get darker. Climax. End.
This one wasn't nearly as well made as the earlier ones. The musical score and direction were markedly worse. Also, presumably since her target market is growing up, the story has more teen angst than the prior films.
Quite predictable and ordinary really. No magic at all.