I have a few American friends, one who's moving up here in a few months. I dunno, never been to the U.S. so I couldn't tell you if I think Canada is better. And I say "eh" sometimes but not at the end of every sentence. Only use it sometimes when I'm asking a question that you could also end with "huh?" - like "well that was lame, huh?" would be "well that was lame, eh?". I don't know any Canadian who uses it more often than that either.