The Hunt for the Truth thing was complete BS. The entire storyline they were hyping up through ads never happened. FFS it's even on the back cover of the game box and yet Chief vs Locke plays no meaningful part in the story. It's beyond misleading...
Since this conflict never happens, it also means that Locke and crew are completely pointless in the story. Why are we playing as these guys? The story barely even makes an effort to make you care about them. I couldn't even tell you anything meaningful about these characters... Vale is really into Elites, I guess. Buck is Nathan Fillion. Tanaka, uh, says the words before drops? Locke is... Stoic? Emotionless?
But as it turns out, Fireteam Osiris actually isn't the blandest group of characters in the game. Because on the other side, you've got Blue Team, who basically announce their names at the beginning and then do nothing for the entire rest of the story. Again, why are these "characters" here? What purpose do they serve other than just fan-service? Apparently Blue Team is really cool in the books, but here they're nothing more than cardboard cutouts.
Does 343's lead writer know about things like "character arcs"? If they wanted to do like a Halo 2 thing with the story, did they think to go back and look at why people like the Arbiter as a character? Or what the purpose of having a multi-perspective story is?
Then there's Cortana, and yet another humans vs. AIs plot out of nowhere, because that concept certainly hasn't been run into the ground yet. Here's what I don't understand... Is she supposed to be rampant? Because that's the only thing that could believable explain this sudden change of character and motivation. But the game tells you several times that Cortana found a "cure" and fixed herself, apparently, so... I guess she's not rampant? She just found the Domain and suddenly became a crazy megalomaniac who wants to take over the galaxy. So Cortana is OK with killing thousands, possibly millions of people just to play the role of enforcer and "save the galaxy from itself." Which is not only totally out of character for her, it's also ironic because the galaxy is probably the most stable in Halo 5 than it's ever been. The Elites have beaten back the Covenant to their last stronghold, the Flood is gone, the Didact is gone, etc.
343 needs a new writer, this shit is terrible.