Timely exclusives ≠ exclusive. It means first. Its practically a buzz word filled with what ifs. I think Ps3 got a better deal in the long run with Bioshiock for example because (forgive the vague reasoning shown) they got everything at a cheaper price point.

With Activison at the helm of publishing I expect that each console will have some form of "I have something you don't" within the forcased ten year span.

Stuff like weapons and customization options really wont matter if the expanse of content Bungie claims it has made is true. And Missions - while nice are likely not to be as important due to the style of the game implied.

TL;DR?

DBO is my DLC. <3 :)