You made a pretty hefty mistake with your proposition.
While your ideas are good, and somewhat thought out, they are overall incredibly presumptuous. You took years of hard work from multiple teams and butchered it without understanding their motives.
For future reference, if you want to get hired, no one is going to hire someone who feels that they have the best way.
Alternatively, what you should have done, and failed to do, was UNDERSTAND Blizzard motives and intentions and then expand on that. This gives credit to those who worked on the UI as well as show that you understand their design intentions and are trying to maintain those. Instead you said, "this is 'An AMAZING and GROUND-BREAKING' discovery in UI" and has to be implemented—which I hate to burst your bubble, is not amazing or ground-breaking.
This comes from another design professional to another. Best of luck and I did enjoy the video overall.
As to the language: I had originally intended this video to sort of be a spoof of Apple's product releases. Hence all of the hyperbole. I changed the direction of the video after I had about 60-70% of the edits in place; as I did not feel that it was funny enough, and I was afraid people would lose sight of the message and simply say, "Dude, you are not funny."
I probably should have rerecorded that audio, and I did try doing that, but because it was so late in the editing process it would have meant delaying the video even longer to release. (And I have no idea where they are in the hiring process, so I knew I wanted to get it out as quickly as possible.)
As to your points regarding cutting out a lot of the behind the scenes development: I agree I made it a lot easier than it actually is to include those types of controls. Everything has to be coded on the front and back end, play tested, etc. In my first attempt at the voice over I went into more detail about how it might be possible to do some of this... but it was 25 minutes long and I did not think many people would listen to it. (Plus I really did not have the time or want to have to edit together what is basically a half hour T.V. show for this.)
So in the end I kept it short and to the point, and made it more like an idealized version of some of the things I would like to see. Sort of like one of those old, "World of Tomorrow" kind of videos.
I am sure there are reasons Blizzard has things the way that they are, but I did try to pick things that I thought would be relatively easily to implement. A little bit of caching here, some sort of XML or Hash file for crosslinking replays with you match history there.
I am glad that you did like the video overall though, and I do greatly appreciate your thoughts and the post!