S&D is my favorite game mode by far. For me, the thought of having one life per round makes the game more thrilling. Well, that and little children raging when you kill them with a claymore on a barrel.
You're definitely right. You really need to play S&D a lot to get a feel for the game. Learning every little spot and route in every map is crucial. In my first game, I sat in a corner with my sights aimed down a hallway for most of the rounds. Eventually, even a noob like me got to scoring around 800 points per minute.
Anyways, the video was well done. I'd offer you more feedback, but I'm rather a newcomer when it comes to channel content and design. Best wishes on your channel!
P.S. I'd rather click on the video of the hairy man than the girl. Seems more interesting at first glance.