I frankly don't mind ads as long as they don't use up more CPU/network as the content i'm already viewing (battery isn't free) -- so no video ads if i'm reading text.

Proper honest advertisements for actual products and services is something I have no issue with -- hell, I've actually managed to save money on car insurance because of a bloody online car insurance ad.

I despise stuff that autoplays video/audio, or moves around on the page, or displays creepy, pseudo-anatomical images engineered to trigger revulsion/fascination (trypophobia stuff or shit like those weird toenail images in those "heart attack" ads or whatever else).

My browser blocks JS by default because I don't enjoy seeing those kinds of shock images. Hell, goatse is less distressing for me to look at than the images in your average chumbox.