Let Steam users get a one week advantage to prevent the zero day pirating. Installing the disc based game, you're asked weather you want the steam verification which doesn't require a disc, or a product key verification which will require a disc. It is true that this system works better as a usage preventer for online games which can check for duplicate keys and ban them for online play (Arma2 Operation Arrowhead uses this system). It is also true that none of these systems are any good at preventing copying. And let's face it, no "normal users" are able to break the disc check so that you and your neighbor can play the game at the same time - those days are long gone.
Waiting the additional week for the store game to arrive, while Steam download version enforces its DRM, is it worth it? To me, it doesn't matter at all, because the stores are ALWAYS late on getting the games I want anyway. Be aware, note that my tone will change on release day
In case it's unclear, I won't buy anything "online based". Many bought PS3 rather than XB360 for its possibility to run Linux on it. In an update they pretty much forced on you, that was suddenly removed. If I buy a car, I won't have them suddenly revert the deal and say "no sorry, you can only have two wheels, please return the other two". Software (and hardware) industry, just a bunch of lying scumm thinking they can change deals as they see fit and get away with it.
I'm also quite amazed by some of the posts here that goes in the direction of "there is nothing wrong with it" followed by "it's annoying"... Just... Wow...