Bob said:
...for a western-developed game...
Yeah, it's a real shame there isn't an androgynous whiny teenager with an oversized sword and garish outfit in this game.
But I kid, and digress. The reason for Hollywood's constant and unabashed failure in making particularly good or honest video game adaptations, be they a fairly bad Silent Hill or a reprehensible Alone in the Dark, is actually a problem with the medium.
Books, movies, comics, tv shows: they all differ in many ways, but they do share a single constant. They all lack any form of viewer input(save for Choose Your Own Adventure, I guess). Sure, TV shows bow to ratings demands, as do book series, comics, and movie sequels. But none of these media are interactive.
Despite what jawless, crotchety old men may mindlessly blurt out, games are an artistic medium unto themselves. But the world they create differs from those created by competing media. The player crafts his/her experience far more than the game does(at least, if the game's any good at what it does). The art involved in a game becomes more than just a story woven by the developer, but a reflection of the player his/herself. Movies can't do that. They can come close, even as far as keeping themselves vague enough that the viewer will craft a perspective that differ wildly from their fellow man, but ultimately everyone sees mostly the same thing, in slightly different ways.
When creating a game, one has to create a reasonable, believable(not realistic, just believable) world, with a sort of underlying consistency. Games often have the luxury of subtlety: depending on how you play a game, there may be entire corners of that world you are completely unaware of. Games have hours upon hours to unravel their story and conjure up their characters. Movies have two hours to accomplish all this. Games have the upper hand with a lot of things: the player is more disposed to identify with their character, since if they don't care for how long they live they're not going to get far in the game. The player is often driven by other, less story-like aspects to complete the game, therefore having a reason to have their ass glued to the chair. Movies have to establish a story, make it involved enough to keep one watching, all while actually managing to tell a story.
Try as one might, cramming 10-80 hours of gameplay into a two-hour film reel is a herculean task, made all the more difficult by a director/writer/producer/actor/grip's passing interest in the medium they are taking things from. So, until you get someone who's actually chomping at the bit to make a movie based on a game, you're going to get mediocre sludge for the time being. Not good enough to be a standalone movie, not loyal enough to the source material to make for a compelling piece for the fans.