The critical drubbing the Harry Potter and the Deathly Hallows: Part I video game received was ridiculously harsh even by licensed-game standards. Despite this, it seems Warner Bros. Interactive are not about to give up on this new Gears of War-inspired take of Potter play just yet. A demo of the PC version has been released and is available here, and supports both keyboard/mouse and an Xbox 360 gamepad. If you don't want to subject yourself to playing it, I've embedded playthroughs of the demo's two levels (a Battle of Hogwarts slaughterfest as Harry, and a boss fight against Fenrir Greyback as Hermione) after the break.
For more information on significantly higher-quality entries in the series, please visit the Harry Potter Wiki.