Yes, they also have the problem that they (are usually implemented in such a way that they) break the back button[1] and make it so you can't easily jump to a well-defined block of the results you know you haven't seen.
I also see them frequently have a bug where they'll just keep cycling through the same first page-equivalent of results.
[1] If you click a result and then hit back, it usually just reloads the page and starts you from the beginning. I think the function of a back button changed at some point. It used to be that "back" was always instant and took you to the exact state of the page before you clicked a link. Now, there's a huge lag on all but the most minimal sites (like HN) and some reload of something gets triggered.
