Which Halo game is the greatest, and why?

[curl-6]

Chrkeller said:

Reach
Halo
3
2
Infinite
4
ODST


Reach is the best because Cortana doesn't interrupt the flow, it has limited flood and the battles are great. Fantastic ending as well.

Edit

5 is the only one I didnt play.  No coop campaign, unless I am mistaken.

Yeah Reach was my top pick as well, the whole "doomed last stand" concept was compelling and very well executed, and the gunplay and AI were top notch.