While I agree Canadian production of television is not as polished as the US, I think this is because o two things. First, with computers being used more and more, the costs for production houses are increasing. Add in a tax regime which doesn't allow for quick depreciation, who can keep up for the new advances. This hit home when I visited a friend who does production and saw racks of 'obsolete' equipment, yet still on the books for tax purposes.
The other, is something my father saw when he was the music biz. When artists would sign a contract, the first thing on their minds was getting an American deal. I would think television actors, production staff, etc, all try to get to the States, as the rewards are better. Regardless of our view of Hollywood, it is the largest producer of film, television and music in the world, and if you are striving to be the best, you will want to compete with the best.