What would you score each Halo game in the 1 to 5 scale?

[im_sneaky]

I thought the whole point was to give whole numbers. People saying 4.7/5 just make it difficult. Is that a 4 or a 5? I find it more interesting when your forced to either go for the 5 or stand back and give a 4.
Halo: 5
Halo2: 5
Halo 3: 5
Halo Wars: 4
Halo3 ODST: 3