Holy cow, that's a list too long to even try here. The Titan of Ether plot, certainly, along with the main Bob White storyline explaining the radical changes to Britannia, and referencing the Avatar's actions in Pagan. But the BIGGEST thing was the complete disconnect, retconning, and blatant ignoring of the entire history of the Ultima series. They didn't even like halfass screw up certain things, they flat missed the broadside of the barn while standing right against the wall in terms of fan service. Lastly, the character of Lord Blackthorn, his fall and redemption, everything about his backstory and connection to Lord British was thrown away and made into a laughably inept Scooby Doo cartoon villian that was incredibly insulting to the fans, writers, and the entire series. How best to fix IX? Get it up to 88 miles per hour, so we can go back in time and see some serious Ultima lore.