A lot of them can get extremely annoying. Even the ones that are good the first time get on your nerves after multiple viewings. I almost just tune out commercials nowadays, lol (as in, I have 2 minutes to go get a snack or something).
A lot of ones I remember from the 90's hold some sentimental value to me now, as I have them on these old VHS tapes. If you count movie trailers, I'm probably interested in some of those.
As for actual products, that's tough to say. I really can't think of many offhand, lol.