Well I've been making my first play through of the Derelict campaign and it's been exclusively on insane difficulty. I'll tell you guys, it's not easy but -damn- is it rewarding. The dogfights are incredibly fast paced, death comes quickly, and you need to learn to rely on your wingmen and on fire support from cruisers in order to survive. About the worst thing that you can do is allow yourself to be drawn away from the capital ships or your wingmen and pounced upon by Shivan fighters. You really need to be able to avoid missiles too because the Shivans use them liberally, and beam weapons from capital ships are capable of crippling or killing you in one blow.
In other words, I love it. It just makes me appreciate the game so much more. Especially the wingmen AI. Earlier today I was going after a freighter, but between me and it was a whole squadron of Maras. So I had my squad form around me and we charged the Shivans head on, and you guys should've seen the amazing 3.6.9 RC7 visuals that ensued as I had to duke and weave my way through exploding Shivan fighters as the friendly AI pilots tore right through them on the first pass, and then I was through and had a clear shot at the transport. It reminded me of that little moment in the opening of Revenge of the Sith when the clone fighters start shooting their way through the droid fighters to clear a path for Obi-Wan and Anakin. It was just an amazing moment.
And that's why I love the Freespace games, and why I'll be playing on insane exclusively from now on. Sure I die more often, but it beats mundanely plowing through swarms of fighters like some super ace. Lately I've only been scoring 2 - 3 kills per mission and that's because I've been generous with the harpoon missiles.