[Edit: Issues, Bugs, and Requested Features should be tracked at Google Code, not here -- matt, 2010-04-23]
Less Wrong is still under construction. Please post any bugs or issues with Less Wrong to this thread. Try to keep each comment thread a clean discussion of each bug or issue.
Requested features... sure, go ahead, but bear in mind we may not be able to implement for a while.
I agree it's losing information, but that's something you have to weigh against the inconvenience of multiple dimensions. To the extent that truth is positively correlated with quality you're just making people click twice, and I suspect clicks are a limited resource.
As I see it the voting system is there to put comments in a convenient order and remove the really bad ones from sight, not to provide opinion poll information.
That's exactly the point: voting is supposed to put comments in order according to quality, so that you can read the worthwhile comments in a reasonable time. My claim is that the current voting system will not do this well at all and that a dual voting system will be better. (That second bit is just a guess). The opinion poll information is just a nice side effect.