Similar sort of thing with the Harry Potter one in the OP - I often can't resist a licensed game just because I want to play as that character (even if they do things in the game that totally oppose what the character would actually do).
The most recent culprit of that and the last licensed game I bought was QoS - I knew, KNEW, it would be shit. And it was.
Things in the film they could of really worked with, focus more on stealth and some mano-a-mano (God I love that phrase) brawls instead of mass gun fights with machine guns in a hotel halfway through a f*cking poker game.
Arkham Asylum was perfect because it looked at the f*cking character. The character is your main selling point - you should be bollocks deep in info on them: how they behave, what underwear they wear, how often they shave their balls (on reflection, perhaps not) - then you build the game around the character, don't build the character around the game and then use some pretty shitty tech to sort of sculpt their face - especially when you've had entire Dev Diaries on 'capturing' the look and feel of the characters *cough* QoS *cough* .