Making the videos in widescreen is probably better, yes ;)
And i don't mind the sounds in this video, every movie maker has to use the tools at his disposal, and if this means using in-game sounds as opposed to NO sounds, then go for it.
Also disable subtitles, as we see it pop up now and then.
And use ZOOM for your shots. Not for EVERY shot, but it really creates variation, which helps and adds to the movie.
You could also try using some more interesting views, than the standard fly-by views, and "padlock to target" views.