Please keep in mind that this list is in no particular order in terms of general game rank, playability, or any other metric that exists outside of my head.
JADE EMPIRE
Jade Empire was a departure from the Knights of the Old Republic franchise for BioWare. The morality system was still there, but the combat was now real-time.
GRAND THEFT AUTO: SAN ANDREAS
While the Grand Theft Auto franchise was thriving on PlayStation 2, its Xbox debut took San Andreas to new heights. A more powerful system allowed for a more beautiful game with a smoother framerate.
BURNOUT 3: TAKEDOWN
The Burnout franchise had enjoyed success before Takedown’s release. Its spin on the arcade racer with a focus on fast driving and crashes was already enjoyable. Burnout 3: Takedown took and refined that formula to perfection.
BROTHERS IN ARMS: ROAD TO HILL 30
Brothers in Arms didn’t invent the tactical shooter, nor was it the first WWII shooter. Far from it on either front, in fact. It did, however, perfect both genres.
FABLE
Fable was never going to live up to its impossible expectations, but it didn’t have to. It may not have been the revolutionary game it was promised to be, featuring a morality system instead of “everything you do changes the world,” but it was still an absolute blast.
ODDWORLD: STRANGER’S WRATH
The Oddworld franchise has always been a little, well, strange. Stranger’s Wrath was no exception. Combining the wackiness and absurdity the series has been known for with solid gameplay resulted in a hit that was also an Xbox exclusive.