As far as feels/nostalgia, and being an all around great game, Halo CE.
As far as lore is concerned and the story this far I'd say Halo 5, that and it is really satisfying to play.
English
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The lore is filled with so much nonsense now.
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Actually the lore still makes quite a bit of sense, the only thing that isn't really that great is how many characters just get offed because they lack relevance to the story.
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That was a big jump
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Why? I like where it started and I like where it's going.
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I know I know, it's just strange to see that there are actually people that would put both bungie and 343 games in their favourites