well, the reason why medieval themes tend to be more interesting is that you are limited in power and ability. Though some people love flaunting powerful magic, it gives an RP more life should you be without magic, fighting magic, with realistic abilities and strengths, not supernatural. Now, personally, I don't create futuristic and sci-fi because stuff people create (like a certain winged wolf) are almost next to friggin godly, and broken. I did create a modern one recently, but I placed a barrier on it, requiring it to be absolutely real to today's society. Unfortunately, since people refuse to be anywhere near normal, no one posted to join that one. However, people have been bound by those rules in a small number of RP's before, but just don't realize it, because the rules adjusted as they went along, whereas I stated all rules at the very beginning.