Which advertisement video in particular are you referring to @alces? If we know, we can have a look. Otherwise you're blocking the means for this website to keep providing everyone with free to play games...
It's the video ads in general causing problems. Before the video ads playing before the game were added to the site it was fine. Banner ads, side ads etc. don't bother me. Sometimes I don't even see what video is playing because it freezes the site. Sometimes the video plays fine but I'm frustrated being forced to watch a 30 second ad before checking out a game and spending less time on the game then watching the **** ad. The video ads make it not worth it most of the time and I start to seek out other sites to play games.