So far, I've seen some great questions, mostly on the theoretical level. As Robert Cartaino mentioned on this question, we are lacking in questions in general that are "Real World" problems, the types of things that Space experts might ask. Most of the questions are what space enthusiasts would ask, primarily bordering on the far future. Most of the questions that I see that are practical are given fairly low attention, and answered quick.
For instance, here's the types of questions I see as being professional type questions:
- What were the on-ground tests that the space shuttle underwent before STS-1?
- What, if any, plans have been made for handling events like a geomagnetic reversal?
- What shielding would be required to use commercial components in lunar exploration?
There are also a good list of the type that NASA might be studying, but aren't a typical space process, like these:
- What maximum speeds can be expected from meteorites?
- How far could we send someone before they get a lethal dose of radiation?
- Could any life from Earth survive in Enceladus' oceans?
And we have a few that while written from an enthusiasts point of view, they have useful information for professionals, such as:
- How will Curiosity manage its power when its nuclear power starts to run low?
- Is it more efficient to assemble spacecraft in orbit, or assemble on the ground and launch?
Below that, we have a multitude of questions which I will be called enthusiast, focusing primarily on a new future technology, idea, or just trying to better understand something that has been done. I won't give any examples, but there are a bunch.
And there are several below this level. Bottom line is, what can we do to encourage people to ask good, useful questions on this site?