We're not going to get into a discussion here in this forum regarding the appropriateness of any particular group of deeplinks. Report any dead links you find in the thread Hutcheson mentioned.
[Edited to add, for clarity: We're happy for people to report listings that are no longer appropriate, in the appropriate thread in the appropriate forum. But a discussion of the overall appropriateness of deeplinking to a specific site really has to be done internally, in the editor forums. As hutcheson notes, reporting multiple related deeplinks can prompt editors to take a closer look at the deeplinking policy for a particular site but, while we appreciate non-editors taking the time to let us know of their concerns here, ODP policies are not -- and should not be -- made in this forum.]