I've been thinking that there needs to be specific feedback with the votes, myself. I'm going to release a "prevent endless September" plan for you all to critique soon which I am willing to volunteer to help accomplish (I'm a web pro) which recommends requiring users to give feedback - I feel that the anonymous, feedback-less, thumb downs with no accountability are a bane to innovative types, as it allows these commonly misunderstood folks to be censored without providing the feedback required for them to figure out how to communicate effectively. What I would like to see rather than a drop down is a box where you have to type at least one word as a reason. That way, you can always put something appropriate, yet it's still not hard to type "trolling" and it's not cumbersome for more advanced people to leave something specific like "appeal to popularity" or "optimism bias" as constructive criticism for the user.

Edit: Actually it would really be best to have a drop down for categories of up/down votes AND a box where you type at least one word. Except for trolling. Where you just hit "Trolling". Or spam.