Beginner's Handbook to DFO

About the dungeons, what's with the exclamation and question marks that pop up above monsters' heads from time to time?

Oh, and what about recipes? Is it worth it to make something from them?

Usually it's to show the monsters noticing something, aggro, TARGET ACQUIRED, you gonna die, yay blood, etc. Question mark I really don't know for sure. lol I've seen them do it at a lot of goofy times (who put this TREE HERE AND HOW DO I GET AROUND IT). Or like when they lose you somehow or something. Not really sure what all triggers monster confusion.

For the most part, no. Some recipes have great things (like Royal Ring and Belmyre Star), but they are few and far between. I toss most recipes. You can always check the AH (for the forged result or recipe itself) to be sure.