I like to quote the tooltips of the UP- and DOWN-vote buttons here:
UP: “This question shows research effort; ...”
DOWN: “This question doesn not show any research effort; ...”
I interpret “research effort” not in terms of science, but simply that the person who is asking should state what he has tried so far and with what success.
I am not happy about the “riddle-type” seeding question because they omit that part, for not giving away the riddle’s solution. For example this question, like some others, just asks for the solution, without telling what the inquirer has tried himself.
I am also not happy with the broad “tell my a bit about that topic”-type questions. An example is this one. Again it lacks any own research effort and is too broad, IMHO. Should we be stricter about the questions an try to avoid ones that are rather unspecific and not narrow?
When students came to me at university with questions about my advisor’s lectures, the first thing to ask them was: “What have you got so far?”