I think juggernaut should return because I never had problem with it.
custom killstreaks should be like in MW2 but not owerpowerd.
in the beginning of every round/match ,you should select a create-a-class and create-a-loadout(could find a better name for a killstreak loadout.)so every time you prestige(there are rumors wich are about there will be 15 prestiges)you will earn a create-a-class slot and every time you prestige twice you will get a create-a-loadout slot.also the map should be huge like in BBC2 .so thet can place wehicles in it(not just tanks but motorbikes ,transports...)
ı also have an idea to make commando more fun for victims.when you use commando from a long distance, your character should start fighting with the other character(just for a second or a little longer) so somebody can save you while he's hitting you.
about the perks, overkill should retun, couse a man from treyarch (his name was van I think)said that ^we dont like the idea of carrying shotguns and machinepistoles as secondry^
also I was thinking about using kinefes as secondry or even as a third weapon.that would be a good way to deal with the knife-monkeys.so ,when you dont have a knife as secondary, you will have to hit your enemy twicw with melee.