For Xbox my favorites would be
Crimson Skies and Jade Empire. Also if you count games that are also on PC Knights of the Old Republic 1 and 2 were both great.
I mostly play RTS and Moba style games now adays as well as ALOT of benchmarking. I do play other games however such as the witcher 3 and Crysis 3, and recently Ashes of the Singularity. I love gaming on the cutting edge and refuse to accept any compromises. Proud member of the Glorious PC Gaming Master Race. Long Live SHIO!!!!