In all the talk of graphical downgrades no one seems much preoccupied with 'why?'. Why build something and then proceed to tear it down, piece by piece, in the hope that ever more diminished expectations about the final product won't be severe enough to...
If you have a save of Dragon Age Origins on your hard drive with the Blood Dragon Armor unlocked, it automatically transfers to Dragon Age 2 as well.
Ser Isaac's Armor set
To unlock the armor set, you have to create an EA account first and then link it with your PSN ID. Rent Dead Space 2 if you don't have it, go the main menu and it should log you into your account. Once you have done that, start your Dragon Age 2 copy and the set will be unlocked. You can find it in your special delivery chest at your house.