Whenever you feel the need to change quotes from big character pages like Superman, first bring it up in the talk page. That way other users can provide feedback and consider if the quote is better to replace the current one. In this case, the quote you included is not good at all.
Almost every major character, including Superman and his supporting cast first appeared in the Flashpoint event. By the time the New 52 started, most of them had already appeared, therefore is wrong to include first appearance in the #1 issues.