Putting my hatred of CoD aside, I'm gonna try and give you some feedback.

1. The intro was way too long, it was almost a minute before we saw any actual kills.
2. Dubstep, really?
3. Was this shot from clan matches and tournaments? I only watched the first 3 minutes or so until I got bored, none of the kills were interesting or showed a particularly great amount of skill, most of them were 2-3 kill streaks (very common in a cod game), mostly you killing people from behind.
4. Stop using slow motion on every kill you make.

It's great you're interesting in making gaming videos, but making CoD videos is probably the worst thing you could have done, there are so so many out there already and yours doesn't seem to have anything special, sorry.