I'd include The Long Halloween just because it's so often noted, as well as Dark Victory and maybe Catwoman:When in Rome, but keep them under a seperate heading.
actually, that'd be a smart way to do it, make the site mainly about good titles, and then include "popular, but not really that good, for A,B, and C reasons" section, and a "totally wretched" section. seeing why a good story is good AND seeing why a bad story is bad is an excellent teaching strategy.
That was more or less my thought. I know there are several books that lots of other people like but that I couldn't get through, like Hush. But I think I'm going to avoid a "Totally Wretched" section, so I don't end up ranting...