I had a ton of fun throughout pretty much the entire campaign. The writing was funny, the missions were fun to play, and the music was great. I don't have anything to complain about other than a couple bugs that were fixed pretty quickly.
Some specific things I liked:
The intro, the vn sequence mini-game where you have to find the imposter, the mission where you attack the radio station, the mission where you jump between different points in the system, the use of new world symphony in the optional mission that introduced Henrietta (that mission's also really hard on higher difficulties), the mission where anna shows up (and what happens if you chose not to help her), the music during the boss fight with the eleventh beta tester, and the ending mission and cutscene.
I also noticed that the acronym for delta 1's over complicated life flowchart would be CASSANDRA
Definitely one of my favorite fs2 campaigns/mods.