No matter how many more Halo's are made or created. I believe Halo 2 and 3 will always be the best. I feel like no others will top them.. Gotta thank bungie for that. I am talking about multiplayer though. Of course following the stories of Spartans, ODST's, and Master Chief has always been great thanks to bungie and now 343.
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Halo 3 > Halo 2 >>>>>>>> Halo Reach > Halo 4 Don't know about Halo 1 though.