One thing I've noticed when playing, is sometimes the AI (enemies) aren't very 'aware'
of things going on.

For example during the Single Challenge Mission "Gang Drive Gone Wrong"
I raid the store from the back.
I shoot and kill several thugs who then die in the middle of the store floor.
And yet the other bad guys are just patrolling past the 'body' as if nothing happened.

You'd think they'd do something, run to cover, flee, search for who shot their 'friends.'

Been playing the game a lot, maxed out my level and am still having a lot of fun
trying to complete all Challenges and Campaigns.

But sometimes the enemies seem a bit 'duh.' lol.