st0pnsw0p on 11 January 2015
How was Galaxy revolutionary? It didn't start any sort of revolution in gaming. Innovative, yes. Revolutionary, no.
Only right answer is Halo. Not only was it the biggest reason for the Xbox selling as well as it did, without which there might not have been a 360, it also greatly boosted the popularity and playability of FPSes on consoles. Halo 2 was also one of the first big online console games.
