The little details do feel a little lacking.
It's weird because on the one hand, hurray 343 have brought back the chatter. On the other hand they've slapped it on everything. Jackals never really talked they just made these interestingly alien sounds while the rest of the covenant would actually talk. Which was an interesting part of their character I think. Also, why do the Hunters sound like bears?
Hopefully I don't sound like I'm just giving the game shit. It just feels a bit off.
If we're being nitpicky about little details, how about the fact that 343i loves to give blue/minor Elites swords? Annoys me to no end. I don't care about any fan theory, because from a purely game design and visual identity perspective it's broken. Some of the most intense moments in Halo are when you spot a high ranking Elite that begins charging at you with a sword. A lot of that forward thinking and prioritization of targets elements seem gone purely for the sake of change.