I cannot say that I like the site, but I have seen no ads, which makes me happy. I don't like the interface, but I can live with it.
However, it is buggy. (for such a simple site, with so many users, it seems strange)
When I save a bookmark, I do not tag it. I just want to keep it. However, when I go to my delicious home page, I would like to add tags to them. I decide to edit the bookmark, add tags, but the tags do not stick when I save the bookmark. This makes Delicious very hard to use, if I would add a lot of bookmarks. Currently, I have no more than 20.