For me, it was Halo 4.
I thought it was going to bring back the classic Halo that I liked. Honestly, I wanted it to be a Halo 3.5. That hope was quickly crushed by the return of armor abilities and other crap.
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yeah I was hoping Halo 4 would be good. I never really hyped it but was disappointed to see we got Reach 2.0 and not a real Halo game.