Rouge Squadron was great, but I had some friends spoil it for me by mentioning that Imperials would not have a reason to attack Mos Eisly and that all the missions were planet based missions.
Rouge Leader was the best out of all. The Space Battles and the graphics at the time were great. Most of all I get to fly my favorite starfighter the B-wing. Still no multiplayer but it didn't need it.
Rebel Assault was a disappointment. It was clear the the development had issues. Watching the internal documentary video it showed that they wanted to make a new engine from scratch which was unsuccessful. The single camera view ground battles felt more like Rebel assault instead of ground combat. The tie in stories were worse than the special edition changes. Multiplayer was very meh, granted that the GameCube and linked/online multiplayer wasn't the greatest. Still there really wasn't a reason no reason at all to fly the TIE Bomber or B-wing over the A-wing.