Primate: how does the rest of the game compare to B5: IFH?
Uhm... I don't know. I haven't played IFH.
You can't really talk about "the game". There's a lot of user-made stuff. It's a mod with it's own mods and campaigns... All this together has it's ups and downs. The flying is as in Freespace 2. Your shields aren't really strong and the missiles are strange. Oh! And sometimes there are way too many capital ships... But Babylon 5 never really was about tiny fighters, so that's ok ;)
Just give it a try, if you're a fan of B5. It gave me the feeling of the bigger battles from Season 3 and 4.