Yes, I think it was great with the health scare for H1N1 influenza and the mandatory vaccination. I'm talking about provincial ones. I think those are really warranted.
I think that tourism ads are probably useful, but the amount of money spent on advertising external to Canada is miniscule, so it suggests that the government doesn't put a lot of emphasis on that.
Generally, advertisements are effective if they respond to a need, and I can think of no greater need than health care.