The first thing to bear in mind is that Episodes 1 through 3 NEVER HAPPENNED! In terms of this game, those stories are completely apocryphal. There are no such things as Midichlorians. The Force is a mystic energy field, not a bacterial infection. Anakin Skywalker was not a slave on Tatooine. He was Owen Skywalker’s younger brother, someone capable of following “old Obi-Wan on some damn-fool idealistic crusade” of his own free will, and having a real knock-down, drag-out angry fight with Owen over it to start with. He was someone for whom Owen had strong personal feelings – someone whom Owen could actually fear Luke would turn out to be just like. Anakin Skywalker did not build C3P0. He did not turn to the darkside out of misguided love. He did it for the same reason everybody turns to the darkside – naked lust for power. Luke’s and Leia’s mother did not die in childbirth. Leia did know her mother, just as she said she did. Yoda did not know of Luke’s and Leia’s births, was not involved in them, and did not instruct Obi Wan to take Luke to Tatooine (If he had, that would have meant Yoda was going senile when he argued with Obi Wan about whether or not to train Luke, since it was Yoda’s idea in the first place, that the children should be separated, and kept safe, so that they could all meet up again, later, at a more auspicious time.)
The only part of the prequels that is true is the basic history. There was a Separatist civil war. It was orchestrated by Palpatine. Clone troopers were used by the Republic to put down the insurrection. Clones did form the backbone of what are now known as Stormtroopers. The Jedi were suckered into overextending themselves, they were betrayed by Anakin/Vader, and were slaughtered by their own troops. Obi Wan did fight and defeat Anakin (who had been Obi Wan’s Padawan) but Obi Wan did NOT mercilessly leaving Anakin to burn slowly and cruelly to death on the side of a volcanic mound. Vader was proclaimed the hero of the republic for rooting out the “Jedi conspiracy” and Palpatine did proclaim himself Emperor. Beyond this, however, the similarities between the sequels and “reality” end.
Oh, and Greedo did not shoot first – Han did.