What would you score each Halo game in the 1 out of 10 scale?

[Cross-X]

I've only had chances to play Halo at a friend's house. I've never played it in depth but here are my ratings.

Halo Combat Evolved: 9/10
Halo 2: 9/10
Halo 3: 9/10
Halo Wars: 5/10 (Absolutely sucked big time.)
Halo ODST: 7/10