User blog comment:Damac1214/Sales of Black Ops II are a "Cause of Concern" for Activision/@comment-67.0.54.121-20121202070525/@comment-92.84.64.106-20121202141642

It was a big change since the gameplay itself got more dynamic. Elites are way harder to shoot, smarter and more agile. Brutes were, like I said, bullet sponges. You just needed ample ammunition. Just play Halo 3 and Reach's SP and you'll easily see the difference.

As for player traits I mean default speed, jump height, strafe, melee bleedthrough, etc. Reach was literally more down to earth.