Mine was Gears of War on the 360. (Hence the OP image)
At the time my primary system was the original Xbox, and I still played on a CRT. Seeing Gears for the first time on a HDTV was mind-blowing, the sharpness, detail and shaders were such a huge leap over what I was used to.
It pushed me to save up and buy a 360 of my own, which was hard to do at the time as I was a poor student struggling to make rent who'd just buy a loaf of cheap bread and some off brand cheese slices and eat nothing but cheese sandwiches for lunch to save cash haha








