Oh man, it didn't take more than 5 minutes blazing through the Boston rooftops before I fell in love with the new Power of the Eagle! It's like Ubisoft recognized that AC3 had a complete lack of quality roof-hopping and is giving a consolation gift to all of the players. Now, we can swiftly and smoothly teleport across the buildings, accomplish brutally awesome Eagle Assassinations, and now we can use Eagle Vision...as a freaking EAGLE.
There's a chance I may have more fun just traversing cities with this power than actually playing the DLC. ;)