There are some decent ones (World of Warcraft, Astro headphones... I even saw a Demon Souls one a little while back). But the Evony, Teeth Whitening and Fitness ones are kinda sad. Evony just straight steals underwear photos for their ads.
Demon's Souls Official Thread | Currently playing: Left 4 Dead 2, LittleBigPlanet 2, Magicka