"..snip...
But, if you really want me to answer your question, you need to supply more information. In this world, where do medusae come from? Why do they turn things into statues? What do they eat? What do they want, and how do they go about getting it? Who is the BBEG? What does he want, and how does he go about getting it? Why does he have a medusa as his #2? How does he protect himself from her? Why is she willing to be his #2? What does she get out of it?
Answer those questions, and I can easily come up with plenty of ways to clue the PCs in long before any actual confrontation. Anticipation of the encounter is the spice that makes the encounter worthwhile, after all.

/QUOTE]
I mentioned this last page, and here you are proving my point.
I think RC examines his encounters and adds fluff and explanation for how things got there.
I do not think every DM does this. If they don't do this, it makes it unlikely the DM will have proper clues in the game for the PCs that there's a medusa in the dungeon, surprise!
Now maybe DM's should do this due dilligence, but 3e already had GMs complaining about workload, so it's understandable how details get skimped on.
Perhaps that is another reason why folks see SoD as bad, because they can see how it can happen.
RC seems to see how it can be prevented, within the RAW, by more dilligent DMing.
I'm inclined to think that changing the rules will help GMswho want to do less work, yet have a fun, challenging, game.