Harry Potter and the Order of the Phoenix is not so exciting as one might seem.
The game is not terrible, but it comes very close. Some of the missions Harry Potter, Ron, and Hermione venture on turn out to be very fun and very entertaining. The developers did an amazing job capturing the scale of Hogwarts, but that "scale" is a little bit too much. For example, some missions will have you running from one side of Hogwarts to the other...and that just isn't fun. But you do not have to memorize your steps because there are little black footprints on the floor to help guide you to your next objective.
Comparing this game to previous Harry Potter games, this one has to be the best. But also the most boring. I remember playing Chamber of Secrets for the Gamecube, and I also remember being entertained. Harry Potter games are improving on graphics and scale each year, but gameplay is key if they wish to return in Half-Blood Prince.