Old, but interesting post about the problem with Reddit.
I would like to see a site where there is more granularity than just the ability to up or down vote. I'd like an opt-in system where, when you up or down vote something, you also get to give a 1 to 5 rating on how informative, provocative, humourous or entertaining the content is. (came up with these in five minutes - suggestions welcome)
These things do not necessarily make content good or bad, but this system could give users more options to filter out material they are not interested in.