delericho
Legend
Thunderfoot said:DM: You enter a 20' by 30' room from the south, a table and three chairs are in the center, a fireplace stands against the north wall, a picture hangs above the fireplace. A door leads to the west. What are your actions? DMs Notes: If the players look behind the painting they will find a wall safe, if they search the backwall of the fireplace specifically they will find a loose brick with a +1 dagger behind it.)
Why on Earth would anyone create a +1 dagger? And then, why would they hide it behind a loose brick in their study, when they have a perfectly good safe right there?

Seriously, though...
A Search or Spot check roll (which is player rules knowledge) can pretty much mean that they can find any hidden object without a real clue where to look by just rolling a few dice. Obviously this is example is poor, because there are many more variables and I didn't want to write a novel for a post, but it isn't so much a "cheating" thing as the DM is roped into 'giving' things to the PCs just because they roll a few dice instead of using problem-solving skills.
Surely the answer to that is to "smart up" (is that right?) the game - make the clues really easy to find, but the solution fiendishly complex. Instead of having a safe behind the painting, have the safe take the form of an extra-dimensional space to which the painting is the key, but only if you can work out the clues. Search and Spot won't help you there, and while Appraise will give you the value of the painting, Spellcraft the school of magic, and Knowledge(arcana) some further clues, the players are still going to have to put it together themselves.
I think the biggest DM rules fiasco came with PrCs. Great idea, poorly executed. In the DMG, it states that a PrC should be "Campaign Specific", and describes them as optional, but then WotC and every third party company wrote PrCs and published them in PLAYER LITERATURE.
I'm with you on that one.