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I hope so, Halo 1 was the best and halo 2 and 3 were good.
I believe the worst halo game was Halo: ODST and then halo reach (in terms of singleplayer, but in multiplayer halo reach was up there as well).
The original halo had very powerful enemies that didn't have much in number.
Halo 2 had very powerful enemies but were very numerous in number,
Halo 3 had weak enemies that were numerous in number.
Halo 1, I believe, was the best strategy

1^7 + 3 + 4 = 8