It does seem rather lifeless... you get the occasional out of game bird flying across the sky and thats about it. Other then that its enemies and real world physics whatsoever.
The AI feels exactly the same as Halo AI but doesn't have that strong personality that the Covenant had either. The simplicity of it all makes it feel repetitive and unoriginal.
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Yeah the AI are just boring to fight and dont really change it up with different movements, tactics and environment interactions. A good example that people pointed out is that the really dont use their extra arms that much for anything.