I'd like a few DMs to give a little input on a couple of questions regarding preludes.

1) Do you prefer the prelude adventure is left up to you, or do you like it when the player suggesting it has a good general idea for you to work from?

2) How do you feel about some type of long term plot or goal being introduced as part of the prelude? Example: Find what became of a companion, recover a sword/ artifact/ thingie.

3) What makes DMing a prelude fun for you, as opposed to just fun for the PCs involved?

There has been a little clamor for a Shevarash prelude lately and I'd like it to be fun for all parties. The reason I am asking the above questions is just out of general curiousity about what you guys like/ dislike or find fun/ boring about preludes. I imagine responses will vary a bit, but I would love to hear your thoughts.