Well, if you look at most RPGs its a good vs evil struggle. Thats all star wars truly was. Its very easy to make an evil empire as the bad guy. look at 7 and Shinra. FF6 and Emperor Geshtal with Kefka seems more to Star Wars than 2 and 4 to me. Evil Emperor Palpatine and Darth Vader want to rule all (Geshtal and Kefka) so to do so they destroy what they know can stop them, the Jedi (Espers). It gets out of hand and a huge battle ensues and Vader gets carried away (just as Kefka did). Very Star Wars-esque.

Plus they also had Biggs and Wedge in the beginning.