I think the main reason I'm fence sitting is repetitiveness. Mainly for the movement procs.
I play CS a lot, which makes it even worse. It's a shame there's a limit. From the video, I could only hear the CS radio commands for movement, at least- it'd probably be cool if you got a couple voice actors to do original work. As is hearing 'Go, go, go!' every minute or so will drive me more insane than 99% hit chances will.
edit: Also, I happen to have a pretty well edited out sound file for 'Let's roll -oll', if you want it. I guess that would only really be funny to csgo players, though.