I miss targeted advertisements. It's important that my OS tracks what my interests are, so that I can be served more relevant advertising.
Advertising that doesn't know my interests doesn't hold my interest, and having no ads means that I have no idea what I'm supposed to purchase next. It's crazy.
I loved the constant pop-ups with offers for things I could purchase. If I don't purchase something frequently enough I get sad so it's nice to have an OS that cares about my well being.