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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I was so hyped for reach And then it came out and it didn't reach my expectations and after that I learnt to never get hyped for a game because it just ruins it