I Pre-Ordered from EB Games ( owned by Gamestop so I get the Doom pack ) and quite frankly, I'm not that big a fan of Doom. Yeah the games were fun when you're locked in a dark room, But that point aside, I'd rather get to choose which pre-order pack i get when i enter the download code into the Live Store, Rather then it telling me my only option is the Doom one. I'd prefer to choose Fallout, Or CoD. Games I actually own and enjoy playing. In the words of another members post 'I'm not an avid fan of doom, I just wouldn't feel right flying those colors.' I too, Have that opinion.
the purpose of different pre-order incentives is to get you to buy that game through that company. it defeats the whole purpose if everyone has the same exclusives. take a step back and look @ it from a business prospective. I pre-ordered from Gamestop as well, and like you I never got into Doom so it doesn't really excite me either. Sometimes Gamestop has better pre-order incentives, sometimes they don't.
Honestly, with the vast customization BRINK has for your characters, i doubt im even going to use anything from the Doom pack neways.