The main problem with dial-up, besides very slow connection, is that you either have to be on the internet, or on the phone, you can't be on both at once.
When we still used to have dial-up several years ago, I swear, my mom's gabby friends were ticked off at me ALL THE TIME because they claimed I spent too much time online, and they could never get through to her.
But I don't see how anyone can have any of these problems you guys are talking about DSL; DSL is FAST, and flawless, plus, you get your connection DIRECTLY from the phone company, so you don't have to share your bandwidth with other people in the same general area as you.