As for attack ads themselves, I'm not opposed to them. When we vote for a president, we are hiring someone to serve us in one of the most important offices in the country. If I'm hiring someone for an important job, and you know a good reason not to hire this guy, I wanna know.
But that's the thing. Attack ads don't provide us with a reason not to vote for someone. The truth (If there is any truth to them at all) is so skewed that it pretty much adds up to a lie anyway.