You can complain about power imbalances and whatnot, but that's helpless cynicism, especially for the developer-types that mostly frequent this forum where the power balance is more even, and maybe even weighted in favor of developers. But power imbalance is irrelevant, the whole point is to figure out a way to determine what it's like to work at the company (which, I suppose, you could argue is tilting any power imbalance back in your favor).
When the interviewers ask if I have any questions, I ask "what's one thing you like about the company, and what's one thing you'd change if you could?" After three or four answers you start to get a picture of the positives and negatives of the company, and it's the individuals' experiences, so they're reasonably candid, albeit you have to read between the lines sometimes.
