What I miss the most is the old Search and Destroy. While they may not have changed the rules at all or anything, the way the maps are set up, they're all rush rush rush rush. I loved how in WaW and MW1 you could actually go slow and plan stuff out.
I actually went back and started playing COD 4 modern warfare. God damn did they know how to make multiplayer maps back then. What the hell happened lol. Black ops and MW3 map packs are brutal! Think I may just head back to playing the old game lol.