Guys I need some help(When do I not amirite?)

I finally managed to get some gameplay of and put it into a video(of course using FRAPS to record and Sony Vegas to edit). I render my video as an mp4 then watch it before I upload it to youtube in great quality. I then upload it to youtube and it is TERRIBLE! Do you guys know how I can fix this? If you want I can give you the specs I used in order to edit the video.

Here's a link to show how terrible the quality is QQ. Also it is already published so it being published can't be affecting it: http://www.youtube.com/watch?v=xa5Sk5jZq8w

EDIT: No being mean, seeing as I do have emotions, whether you guys like it or not <_<

nice gameplay keep it up