Nigma is like that kid at school who was told they were really good at something and never saw fit to bother practicing further. He's smart, but the problem is that he believes he's super duper smart.
I think anyone could run circles around Nigma, as long as they've got some form of wit and self control in hectic situations. Unless you're Croc, in which case you just burst through the walls in the maze. Riddler just refuses to let anyone win or have the last word. He mainly wins because he outpaces everyone else. I think the only person who could seriously outrun Riddler, aside from Batman, is The Question. A conspiracy nut who treats every possibility, no matter how improbable, seriously would be Nigma's worst nightmare.
When it comes to superhuman intellect, well, they should be smarter than him. But then again, their intellect doesn't equal their wit. The hero/villain may be an all star mathematician, but the moment you hit them with a wordplay puzzle, they're fucked. I don't know much about Superman, but I think he could get frustrated easily with Nigma and his loopholes in the riddles he poses.
Out of the entire Rogues Gallery, he's probably in the top five of being the smartest, but I'd say Ra's al Ghul and Joker can top him.
That's my opinion, anyway. Nigma is my favorite villain (and sometime hero), and the fact that he has these faults about him is what makes me enjoy his character so much. Hope that somewhat answered your questions.
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