Not sure you were aware but there were probably at least 4 similar sporcle quizzes out there-- however your take with the real names are new..
The only thing I would recommend is taking some of the abbreviations-- like Dr. Light or Mr. Terrific--its not that big a deal but from reading other sporcle comments on other games-- it really annoys some people... (same with not needing the apostrophe in Bwana Beast..)
Hmm I didn't know there were other ones. It's hard to find comic book related quizzes on there sometimes but of course it didn't occur to me to just search for Justice League. You don't need the apostrophe for bwana beast to count but I will update the doctors.