Youtube is clearly out of control in the serps and it points to how big brands can dominate for no other reason other that their are big brands and not because they are an expert in the topic being searched. No site should have multiple listings like that. Youtube should probably be near the top but they should have one main listing that is slightly larger with an image and the link to the video followed by 4 or 5 other related video links, like how Google displays links to multiple forum posts from the same site. The searcher can then click on the link they want and search further on youtube if need be. The problem with videos in general is it is hard for search engines to determine what they are about.
A funny example is try searching for Google's domain name on Google. The third listing is a Youtube video with Google in the title but it is nothing about Google itself, it is just some music video.