Operation Anchorage was fun, but woefully short. I do want to note that I completed it at level 20, though, so it was stupid easy.
Gauss rifle is cool as hell, but you can't repair it yourself. Oh, and the armor you get out of the game is glitched. You were supposed to be able to repair it with conventional power armor, but that's not the case. However, it has something in the range of a million health.
Overall, fun, but I wish it wasn't so.. linear.