I personally loved how on black ops 2 you can mute everybody but your party, I know that ps4 has party chats, but what if you're playing search or something? wouldn't you want to mute the annoying enemies within 2 buttons?
Another thing I personally loved, the party leaving in mw3. If you were the party leader, and you backed out of a match, you have the choice of taking the whole party with you. Now thats just amazing, don't you guys think? Instead of re-inviting everyone and waiting like 4 mins, you can just take out the whole party and instantly find a new lobby!