"Strategic" voting is pretty much unavoidable, since voting has some cost (however mild). It makes sense to vote when you think it will make a useful contribution, by expressing a different POV than other LessWrong contributors would. Does this make scores less representative? It's not clear that it does - how many people would care if some unambiguously good comment is at, say, +17 as opposed to +19 because some users just didn't bother to vote it up?