Halo was the first game I got on my Xbox back in 2001. I no longer own it, but I loved the single-player as well as the multiplayer, and to this day I'd say it had the best story of the series. Never really got in to Halo 2, I mean I never even owned it: I borrowed it from a friend for a couple of weeks and never really enjoyed it; well no way as near as the original. Halo 3 was the first game I got for my Xbox 360 last year, and it remains the best game for online play in my collection, the single player is ok as well, but not as good as the original. Don't own nor played Halo Wars or ODST. Not interested in Wars, but ODST being a expansion pack to Halo 3, looks to be my style.