Let's face it the game possesses no longevity at all.
Halo 3 had customs and an excellent matchmaking system that kept it going.
Halo Reach had -blam!- customs and an even -blam!-er matchmaking system
Halo 4 has no customs and an even -blam!-er matchmaking system than Halo Reach.
R.I.P Halo
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I'm sorry, what? No customs? As I remember it, Reach had better customs than 4, 4 is pretty much 3. You're blinded by nostalgia, and that's coming from someone who is constantly feeling nostalgic.