I really don't think we can blame most of the problems with Robotech's Masters Saga on Robotech's editors though. A fair bit of it comes to us directly from the original source material... Super Dimension Cavalry Southern Cross. Jeanne Francaix was obnoxious as hell in the original, and it carried over when she became Dana Sterling in the Robotech adaptation process.
I get the impression that Carl Macek and company realized how unlikeable the character of Jeanne Francaix was, and that her main appeal in the original was periodic nudity, so they did their best to give her alternate appeal in the form of an arbitrary relation to a much more likable set of characters (namely, those of the Macross Saga).
Southern Cross had a lot of problems, and most of them survived the adaptation process intact. The main character trio of Jeanne Francaix, Lana Istvana, and Marie Angel really devolved into Jeanne Francaix and two minor background characters, reducing the screen time of the two far more likable members of the trio. The rest of the background characters were horribly unlikable because they existed mainly as either "straight man" comic foils for her pranks, or as victims of her particular sense of humor. The character and mecha designs didn't really wow anyone either, and the story trailed off into a clusterfuck before being canceled altogether.
If anything, I think that Southern Cross is the only example of the source material being improved by its inclusion in Robotech, though only due to its association with two other, far better shows that give you an incentive to watch it if only to string the plot of each end together.
The really sad part is that Super Dimension Cavalry Southern Cross had potential. A lot of the early draft mechanical and character designs were a lot better than the final versions that made it into the show, and has the story not been truncated after the show was canceled, it would've had a much better ending too... where the human forces on Glorie discover that the invading Zor are really the descendants of temporally-displaced human space colonists.