It's true a single shot from the death star would destroy a borg cube, but would they hit? That laser didn't look like it could be aimed without just rotating the entire station.
It'd take a long time for the Borg to be able to assimilate the Death Star because it's just so damn huge, but if the goal was to destroy it: "SCANNING. SMALL EXHAUST PORT DETECTED. FIRING WEAPONS DIRECTLY AT EXHAUST PORT".
The first Death Star was direct, but the second Death Star had some aiming capability. It was able to pick of starships without being directly pointed at the target.
But it's a moot point anyway. Thanks to Voyager, cubes are perhaps more maneuverable than SW capital ships.
Depends. Which one is Batman with? Does he have time to prepare?
http://www.youtube.com/watch?v=pdgVnwo-Szk