I am currently playing through Hellgate Ikeya; will post anything as I encounter it. I would wait until I'm done with the campaign, but I figured I'd let you know somebody is at least playing through them. I'll finish a few more missions tonight, but I'm working this weekend.
HGI - Mission where you protect the Zod transports; If even one is destroyed, the mission doesn't end until you jump out. You are then reprimanded for letting all the Zods and the Galatea be destroyed.
I can't think of any specific examples, but some of the briefings and messages have a few quirks in them. Nothing to big, but a few things might need to be polished up if you ever plan to have the campaigns voice acted (it would be awesome). There are run on sentences here and there, a few words spelled wrong, and one "

". A few of the briefing paragraphs just read a little "awkwardly". Most of it is grammatically correct, but doesn't sound right to my native English ears. I wouldn't even mention it if the FREDing wasn't done so well, though.
Example:
Admiral Ross is relying on your skills as escort pilots to locate that mysterious entry point. Two wings will be assigned to guard each cruiser.
The cruiser will conduct a long range scanner sweep of the system. If a Shivan entry point is out there we will find it.
This is the first stage of a briefing, and it assumes I already know that the plan (presumably) is to fan out several cruisers with fighter escort looking for Shivans. I might've said:
Admiral Ross is relying on your skills as escort pilots to locate the mysterious Shivan entry point. Several Fenris and Leviathan class cruisers from our escort fleet will be deployed to conduct long range scanner sweeps of the system. Two wings of fighters will be assigned to each cruiser to ensure their safety in this operation. If a Shivan entry point exists out there, we will find it.It just flows a bit better, and lets the player know the plan.
Don't kill me for revising the writing...

RoR -
Mission 3 - I love the second two missions The Familiar. The only thing I could find wrong with them was that when you're protecting the docked Taranis, the Taranis fires its turrets in self defense. This makes the mission a bit easier, I'm sure, but the Taranis was disarmed by the Galatea fighters in Ikeya.
LoA - To be played later.