Let's Play Halo 4 - Parts 1 & 2

I've decided to try my hand at doing a Let's Play again, with a Let's Play of Halo 4. Parts 1 & 2 went up earlier this week.

Part 1:

and Part 2:

There will be an audio difference between Parts 1 & 2, as I was, well, using my webcam mike for Part 1 instead of my condenser mike. Also, there will be a little detachment from the audio and the gameplay as I'm recording my audio on a different device than my PVR.

Any feedback you can offer on how I can improve, voice-over wise, would be appreciated. I'm also going in cold, so please avoid spoilers if possible. Thanks!