1. Halo 3
2. Reach
3. Halo 2
4. ODST
5. halo four
Campaigns are irrelevant, sort them in order of the quality of their multiplayer.
I can't remember that much of combat evolved multiplayer, so I can't really rank it with any certainty. I actually enjoyed Reach's matchmaking slightly more than H3's, but I have too many fond memories of H3 custom games to rank it anything other than first.
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Halo 3 Halo: CE Halo 4 Halo 3: ODST Halo: Reach Halo 2