I think you've got it backwards. Without Halo, developed by Bungie, the Xbox brand would have floundered. The original xbox didn't have a lot of top level exclusives in its first few years and Halo saved that system. The PS2 dominated that era. Xbox had Fable, Halo and KOTOR as it's anchors. of course there were a few other games, but let's be real....Halo was the legs that Xbox walked on for a couple years.