It still seems to have bugs. I made it into the bunker to disable the blast shields. The place was completely empty, no one to fight. I disable them all, talk to Warren, and as I do, the cutscene shows a locked door open. But when I go back to the door, it's locked, and I don't know how to unlock it.
EDIT: Scratch that. I was at the wrong door. There still was a conspicuous absence of Imperial forces, though.