Doom movie scriptwriter Dave Callaham directly addresses fans concerns about the upcoming adaptation of the the id Software first person shooter series in an open letter posted exclusively at HomeLAN:

"The screenplay I wrote DOES differ in a number of ways from the games. I want to be very honest and forthcoming in saying that, and I know that I won't make any friends amongst the fans of the game in doing so. But it should be mentioned that it was never the goal of anyone involved in this film, from myself and the producers to the studio to the guys at id, to make a direct film adaptation of the game(s). The thought process has always been to create an extension of the Doom universe that will give fans an interesting new take on the themes that they've come to enjoy in the game. Because let's be honest here: as far as a completely immersive and cinematic experience, we were never going to top Doom 3 anyway, and we all knew that. Instead, we have toyed with some elements of the game, and yes, I am pretty much solely responsible for that, since it was my pitch and my screenplay that got made. Let me assure you, though, that the themes and elements that you love about Doom are ALL represented strongly in the film...just with some new twists"

For the full letter, click here.

Thanks to 'John'.