Last game I ended up getting quite a few great artists and had real problem finding any use for them... Apart from joining your city for + 3 commerce and +14 culture (wow, not that exciting) the culture bomb aspect of them is rarely useful as far as I can see, and was doing well enough not to really need them to research techs for me. Obviously, they are good for a culture win, but I never really go for culture wins... When I was building wonders I noticed that a lot of the ones I wanted to build added to the chance of getting great artists. I didn't get many great merchants, but the ones I did have didn't seem to achieve much, I just sent them on trade missions for gold cos I was feeling lazy. Great scientists are far better with their academies, and great prophets are essential seeing as I founded 4 religions, but I only ended up getting 1 in my last game, so I got no real benefits from founding the religions. Usually I chop stonehenge which lets me get more great prophets early on, but I missed it this turn and had trouble fixing it so I got any. Am i misusing my great artists/great merchants? I know early in the game joining them to a good city is the best idea, but when I got a great merchant etc close to the end, there aren't enough turns left for this to be worthwhile.