The art style and music was much better back when bungie was around.
343i had 3 goals with Halo 4 and it was easier than scribbling.
-It has to look/sound like Halo (Failed)
-Has to feel like Halo (subjective, although most of the community think it doesn't feel like Halo)
-It has to be like a core/traditional Halo1/2/3, Halo game (Failed)
Instead they copied COD. Halo 5 better be like the traditional Halo's, 1/2/3 and not some pathetic COD clone trying to attract casuals and cod fans and ignoring the please of their own fanbase. The casuals always leave (most of the time), cod fans obviously went back to cod rather than play a shitty clone and their own community was abandoned and most of us left, you are lucky even 20k people play Halo 4 to this day. COD is popular not because it caters to casual or a mainstream game, it's because it stays the same every year. Why do you think so many people player the original 3 Halos?! Reach was still popular but not as much as originals because it still was largely traditional but not as much as the originals. Halo 4 destroyed the core and can barely hold itself together after it had a lifespan of 6 months. Halo 2/3/Reach had a lifespan of three years or more and had a higher population!
The music is much better in older games and the art style (although Reach was too grey and gritty and had too much motion blur at least it still looked like Halo).
EDIT: I made my opinion sound like fact. Didn't mean to sorry.
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Halo 3 - Choose Wisely Nothing will bring me to the reverence and nostalgia of the good days of Halo than that track. Man the memories. It sums up how great Halo was back in the day and how it's nothing like that now. Only those who actually played Halo 1-3 can really understand music like that beyond the "sounds good man". More like "Those were the days indeed, I was there and it was truly a masterpiece".