I'm glad to see them importing shows. I love getting to see stuff from other parts of the world. I'm still hoping that someone other than Hulu might get the guts to start importing foreign language shows someday.
Like Christopher said, it's a good way for them to actually bring in more real SF/F shows, and to me that is a good thing. Besides there really isn't that much of a noticeable difference between American, Canadian, and British shows other than the accents. Hell none of the actors in Lost Girl and the bits of seen of Continuum even have noticeable accents, so if I hadn't known beforehand I probably wouldn't have even realized they were imports from another country.
EDIT: Just watched the Series 1 and 2 trailers for The Almighty Johnsons, and it looks great. I would love to get a chance to see it someday.