I'm okay with them for the most part. The only thing I find annoying about them is when they pop up over and over. But then that kind of behavior usually just drives me away from the site in general.
@FairyGirlGemma I'm sorry. I like those better than the number/letters embedded in chaos ones though. In fact I worked for places that had to make those pictures. You literally get paid like 1-2 cent a picture:(