I would say yes for objective gametypes, no for slayer. And it might work better the way Battlefield does it, attaching a third-person camera to the person who killed you, instead of playing a first-person recording of when they killed you. It shows their location, but it's not as disorienting as a CoD kill-cam.
No. Nothing from that piece of crap COD should Halo be. Reach was already a f***-up and the last thing I need is to have the very game that made me love gaming turn into that filthy poison call of duty!