It is more than a Video Game, well to me anyway. Halo is the reason I did things Like:
Get Xbox Live
Buy an Xbox
Stay up Countless nights sippin on dr.pepper and poptarts
Held Local Tournaments
The reason I wanted to be a Game Designer, seriously! I was amazed at it, my first match on my grandmas xbox, Snipers on Acsension.
Everything! It was a good, long run though.
[Edited on 04.15.2010 4:32 PM PDT]