Which Halo game is the greatest, and why?

[TheTitaniumNub]

1. Halo 3
2. Halo 2
3. Halo 4
4. Halo Infinite
5. Halo ODST
6. Halo CE
7. Halo Reach
8. Halo 5

I have a somewhat controversial list, but I think 343 was fine for the most part. Only one I truly didn't enjoy much was 5.