There are some cutscenes where it bothers me. Like the very last one when he is facing off the Didact, he has a BR, when by that point you would've long run out of ammo with it. Would it have been so bad to have him with a Lightrifle or something more appropriate?
Chief is just that much better than every Spartan IV. They need DMRs to fight; he'll beat the Covenant, the Flood, and the Forerunners by himself with just an AR. --- At Capcom, DLC=disc-locked content, not downloadable content.