Hey there,
Number one, put a teaser before your intro. Helps retention. I can't comment too much on the content since I'm not into MC, but it seems pretty legit. I'd scrap the on-screen text in favour of some flavouring (like screen edits when you kill someone, perhaps?). If you still want to keep on screen text, pls don't use that balloon font...it's horrid. Ad some shadowing under the text too to make it pop and seem more professional.
Fill the screen with your video, there's something weird with the way you rendered it I think so it's not the proper resolution for widescreen. Just stretch it or something, or else fill in the black sidebars with a blurred out version of the video content (stretched).
I think you need a better thumbnail too. It's not eye-catching in any way and would not want to make me click on it.