To be honest, when I do searches on google video, I always hope I get a youtube result. If it's not, it's often a webpage with an embedded youtube result, but the native non-youtube videos are even worse from a usability perspective. I sometimes use site:youtube.com to improve this. Youtube is just really good and the vast majority of competitors are bad.

Except for Vimeo. Vimeo is great. And I hope we get more youtube competitors.

EDIT: Also, I don't like the search system within Youtube itself. Googling for videos seems to work better.