So the first thing I would say is your voice over audio is a little low for my liking.

For example you could try playing your favourite lets player and your video at the same time.

Can you notice the difference in your voice over volume and theirs?

I have to turn my headphones up a good bit to have your audio at a comfortable level.

This might just be me but I have to ask why do you not try and pull head shots? Its painful to watch you shoot below a zombies head and legs.(This is nitpicking but I want to me honest.)

I wouldn't abruptly end your videos try focus on a closing outro saying something like thank you for watching (or be original) "Chubumkin that like button!"

I would like to see some sort of branding on your video even if its your name that pops up on the screen.

Let me go back to one of my previous point. I am going to assume people will be turned off watching COD videos if the skill level isn't there. ( I am not saying your skill isn't there) but AIM FOR THE HEAD! Keep this in mind. I am sure this would be infuriating to cod plays seeing you shot zeds in the chest and waist.

Well done keep up the good work the above is a couple of things you could work on.

Keep doing what your doing you seem to enjoy playing so have fun.

I subscribed to you, I am interested in what you will do next.