well has it been proven that killcams take away tactical gameplay from halo? no, then you dont KNOW anything you just BELIEVE it. you cant know how it will effect how halo is played until it is out which is my point, you may be right it could be the worst thing ever added to halo but we dont know tha until its out. halo and call of duty are very different games, killcams might not work in the same way when it comes to effecting gameplay.
by hiding places you mean camping spots? hopefully the killcam will stop people from sitting in the same place, for fear of someone coming for revenge.