Giving players the tools needed to create custom missions in a game like inFamous 2 is a wonderful idea, as long as the tools are easy enough that anyone can use them. You be the judge.
https://lastchance.cc/infamous-2-will-have-in-theory-an-infinite-number-of-5773867%3C/a%3E%3C/p%3E
See inFAMOUS 2ās Mission Designer in Action, More Details on Single Player [PlayStation Blog]