I don't like them, but I'm glad they are there, as they are important. They make me hate cigarettes even more, which is the point. I think they are effective, but I don't know how effective they are against people who do smoke.
I don't really watch much comercial tv so I haven't really noticed them. The pictures on the packaging are gross though. I wonder whether the tv ones make a big difference to the rate of people giving up smoking?