If you had good referals from Sympatico I suggest you check your listings. They recently changed the interface that show only "most popular". If users want real results they have to click some other tab. I believe a lot of users will switch. (especially that you have to wait twice for doubleclick to display the adds... )
Sorry, I tried the French interface at www2. It is still "popular" by default on the English interface. Hope they will change this soon. Sympatico is # 2 for my French Canadian sites.
I definately noticed a big difference during the time they'd switched to the tabs. I think I'm the only one here getting quality traffic out of them. My demographics just line right up with them.