Quidditch World Cup uses the same graphical engine as previous Potter games. This gives the game a nice look that really goes along with the feeling of the books. All of the characters look great (if a tad creepy at times) and are easy to pick out on a fast-paced field. This includes some less written about characters who you only hear about in passing in the books. The Hogwarts Quidditch pitch (field) also looks great. However, the real graphical magic comes in when you move beyond Hogwarts and into the World Cup settings. The World Cup pitches look remarkable and really show off some great special effects - even at the game's high speeds. It is really hard to keep your head in the game the first time you encounter some of these areas because you want to just sit and stare. Each of the World Cup teams, representing countries from around the world, has their own distinct look and uniform. I really liked the variety offered, but did have a problem when there were two teams whose primary color was yellow - which got confusing. In-game cinemas, which show both victory stances and special moves, are nice additions.
Sound is just as tight and really fits with the action in the game. The in-game commentary is great and manages to keep up with what's going on in the game (which gets hectic at higher difficulty levels). The soundtrack is made up mostly of classical scores and highlighted by Messa de Requiem: Dies Irae and Messa de Requiem: Requiem. The names probably won't mean much to many of you - but trust me, you've more than likely heard the music.