Close and similar ideas, but I don't think it is a rip-off. It's not a battle of Good Heroes Vs Bad Heroes (or Good Heroes against the whole world!!) even though there is Sylar and Nikki, there is not a case of one group against another. It is more a case of a dozen or so individuals who have powers that they are just discovering and discovering what the purpose of their powers are.
In X-Men, it's a bit more childish to be honest - I mean there is no "Storm" generator, or Wolfman with "Adamantium fused to his DNA through a military genetic experiment" , and there is no "Laser Vision" etc etc.
I would say it has roots in X-Men and does pay homage to that theme, but it is no rip-off.