You are one of the few people that are excited. I hate the modern warfare feel you speak of. I enjoy CoD black ops.
I absolutely hate getting thrown in to the middle of a match. Quitters run rampant through the servers and ruin games. It's not Halo with a twist. Quitting was frowned upon, everyone being on a level playing field was what separated it from call of duty.
Halo 4 is Call of Duty with a Haloesque twist. I'm not excited for the future. It's not halo. It is however a fun well made game.