>>flurdy+(OP)
Slashdot didn't win for several reasons, but the voting system in general had the problem of only giving you voting rights sporadically (I think it may have been coupled to recently earned Karma or something). The effect was that inevitably when you wanted to vote you couldn't - and vice versa. Also, the UI was a dropdown box, which made it tedious to vote. But I do think being able to state the reason was a good idea. It had the added benefit of letting the voter know what the voting considerations should be in the first place.