I imagine what would totally sell me on it is interactivity with a live game. Imagine if you could hook into the game and show live data on the last kill, where you hit him, how much damage you inflicted and why. Would be really cool, but probably not allowed without getting banned.
This probably sounds like an old man but Halo 2 weas doing this back in 2004 when you could immediately after the game get detailed game reports, even available via Rss.
No surprise that Bungie made revolutionary games with Halo (series) and Destiny. Halo 1 was the basis of FPS on the console and Halo 2 was the basis for Xbox live
Golden Eye was the basis of FPS on the console, after which Perfect Dark and Time Splitters followed.
What came later was Halo and its 2-concurrent-weapon + auto-healing formula that was more forgiving and modern-arcadey that redefined (but did not invent) console FPSes. It may have also introduced the dual-analog control style for FPSes on consoles that have since taken over.
