They need to remove Radar Jammer from every map that has it and replace it would Orbital Strike. All you have to do is shoot the Jammer and it explodes, it has a small radius and not even that good for Crash Site. Orbital Strikes are much better for Crash Site.
Ceth Gunship on Sanctuary would be great, although Maximum Nanosuit can be quite effective at the entrance of the Sanctuary in the corridors and also at the back of it by the stairs.
I am not really bothered if they let us choose our killstreaks or not, but it wouldn't work like in COD because some killstreaks will not work on some maps i.e. Radar Jammer, Orbital Strike and Ceth Gunship wont work on Terminal and Impact.