I hated this at the cinema. Many months later I rented it and gave it a second chance. I hated it even more.
This book is several hundred pages long and, despite the title, only a small portion of it is about the Goblet of Fire/Tri-Wizard tournament. And yet, that's all you'll get out of this movie.
It's like asking for a peach and getting only the pit. Asking for an apple and getting only the core. Asking for sex and getting handed a used condom instead.