Because MS wanted to cram in all the DLC before the next generation launches, people no longer have much of a reason to stick it out for the game. Besides, y'know, actually playing it and enjoying it. Weren't there Halo 2 map packs launching well into... holy crap, 2007?! Wow. That [i]is[/i] late, I had no idea.
inb4its because the game sucks
inb4opcantinb4
inb4inb4opcantinb4 maybe.
I should point out that H4 was my personal GotY 2012, but it didn't have much competition. Trials Evolution was the other frontrunner.
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Halo is old now. It is starting to suffer just like other aging franchises (Ex. Call of Duty, Assassin's Creed). 343i had to try to innovate to keep the game fresh, but they also had to keep it Halo. Blah blah blah... After 6 fps games, Halo is stale. People who have played since CE or 2 are just burnt out on it. The reason Halo 4 is downgraded on this forum and the others are praised can be summed up in one word: NOSTALGIA [spoiler]COD's population stays high because of customer appeal to teens and its more accessible and easier for casual players.[/spoiler]