1/ Loading ads should not cause the rest of the page to hang, certainly not for 5+ seconds.
Sometimes I have to reload the page 2 or 3 times to get an ad that will actually load.
2/ Your ads should not kill my browser. Half the rollout-with-audio-might-play-will-annoy ads cause FF to judder along.
3/ Your ads should not fuck your own sites design. As I type this the entire DiS logo is covered by a fosters ad.