I like this tv show too!
But, there's one I enjoy even more: Scorpion. Also kind of a superhero show without real superheroes.
Four geniuses with very high IQ but very low EQ, one 'normal' person to translate the world to them, and they helping her understand her genius young son. Doing missions for a special government team that no one else can do.
I particularly like the character buildups and arcs.
But Limitless is very enjoyable as well. In a way the shows resemble eachother somewhat, they show overlapping themes of being a genius and seeing comnections no one else can fathom because you're IQ is through the roof.
Speaking of tv series anout geniuses, it's also why I loved House, even Blackadder, and why I've recently become a total Sherlock geek - by which I mean Sherlock the BBC tv series with Benedict Cumberbatch and Martin Freeman. That show makes me laugh and cry and everything in between. Totally awesome.