For our part, we do not allow popup/under ads, ads that automatically play video or audio, or anything else similarly obnoxious. If you see such ads, or anything with objectionable content, please let me know and I will have them blocked. Usually our ad ops team will need a screenshot and/or a link to the ad so that it can be targeted.
Bear in mind that we do not and in fact cannot vet every ad that is served, before it appears on the site. Ads appear differently for everyone as well. So often, it will take a member spotting and reporting it before we can nix it.
I have not seen anything bad here yet. At the moment I am seeing a static banner for Hyatt at the top, and a static Marriott banner at the bottom.