Halo 5 has the best overall campaign

[mendicantbiasOffensiveBias]

People are split on the story but I think it had the right content but not execution. The gameplay is the best in the series in my opinion. It has open and immersive levels with great combat variety. You could argue reach has better gameplay and halo 4 has the best story. Still, the heavy enemies, gun balance, weapon sounds, good acting/mocap, incredible visuals(despite some low rez textures). Everyone loves the Mp but I honestly think the campaign is the best. It was also our first glimpse of sangheilios in a game.

[Drizzy_Dan]

There were some good aspects to the campaign of Halo 5 but I have to disagree with you on this being the best campaign. I really think that this campaign was disappointing in gameplay and narrative. You bring up good points but the lack of character development, real danger, and the absolutely poor mishandling of Cortana has led my ultimate disdain for it. 

[Twinreaper]

ODST had the best campaign of the franchise period. I have not played Halo 5, but honestly after watch the myriad of youtube videos on the matter, the campaign looks like a garbled mess of forced story telling, pore character execution and a rehash of every sandbox item in terms of level design.

[FIREN4]

I didn't like how the marketing didn't match how the story played out and I couldn't get attached to most of the characters either. There were quite a bit of fun and creative levels and gameplay moments however. Best story and game altogether would be Reach for me hands down. I felt attached to Noble Team and there was excellent character development and gameplay and everything really. 

[IIIKatanaIII]

The story and the OST of Halo 5 is the worst of all Halo games in my opinion. Some oher aspects of the game are actually quite nice though.

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I don't like the fact that Team Osiris are being highlighted. The only great character in that team is Buck.

In combination with the previous Halo 5 trailers I had the feeling 343i was trying to let 117 die and be replaced by Locke...  :-/

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Concerning the soundtrack I was absolutely dissapointed.

After playing the game through a few times I figured out that there was not one single track that touched my heart or blew me away like it did in every other Halo games.

Even though Halo 4 had a completely new set of tracks some of them were actually very nice to hear after a while. And the game did have a few action-like and emotional moments were the OST just fitted in perfectly.

But Halo 5... don't remember any. Accept for few classic tracks from previous Halos which I do not count.

I honestely like every OST of every Halo game (even Halo SA and Halo SS as well as Halo Wars 1+2). Halo 5s OST is the one and only biggest dissapointment of all Halo soundtracks in my opinion.

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Having no split screen co-op and really dumb friend AI belong to the worst things in Halo 5.

I get the idea of you being the leader giving orders but I never thought that your team would be so apathetic and stupid if you are going lone wolf. Even if you do give orders your team sometimes behaves like as if they are mentally disabled. The friend AI in other Halo games were definitely smarter.

Leaving out split screen was also a very bad idea. I played Halo 1-4 with my girlfriend on split screen but can't do with Halo 5. No sir! Glad that won't happen again in the future.

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What I do like about the campaign are the level designs. There is actually not one single level that I would skip because they all look fantastic and are fun to play. Plus they offer a great amount of playing time.

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I love the Hunters in Halo 5. They are here what I always wanted them to be. TANKS!

I also like the Soldiers as new enemies and the Knights being more tanky as they were before.