Really? I found the missions to work extremely well for me. Which particular ones were imbalanced? I'll give to the fact that the huge numbers of bombers tends to get a little unbelievable, but otherwise I found it well done, especially the TAG mission.
The bombers are exactly it. The one where you have to defend the Moloch against about 50 of them, plus a Sobek and Hecate, is quite frankly impossible on anything above Easy.
The one where you have to fly in a straight line for 20 km just to scan a Pegasus with no lifesigns is both boring and frustrating.
The TAG mission, on the other hand, I thought was great.
It was my favorite mission out of all of them, and the balance was pretty decent too.