Somehow even worse than Broken Steel. When I originally played it, it took me six tries to start the DLC without the game glitching or crashing, with four more freezes coming up later during gameplay.

Was it worth it? Of course not. The setting might have been interesting, but as it its, you're stuck in a loop of kill aliens -> find an inconspicuous switch somewhere -> kill aliens, and said aliens are very resilient to damage and take a while to go down. The sequence drags a bunch, as well. Awful.