I see killcams as another noob friendly tool. I'm glad they were never on the Wii. MW3 is noob friendly enough. Imagine having a camera that always showed where you were when you killed someone. That brief glimpse they give you on the Wii is enough.
Stuff like that should be in a separate playlist in my opinion. Like a "beginners" playlist. That's the place for deathstreaks, akimbo machine pistols, and kill cams. A separate list where crappy players can go, get some help, and feel like they are doing something. Nothing more annoying than getting mowed down by some kid using akimbo with a 0.5 kdr or being blown up by dead man's hand because a kid got owned. Maybe if they had something like that kids won't feel so obligated to hack because it's the only way they can win.