...I would play this game some more to test it better. For now... is it a bad game? No it's not, nor it is the little masterpiece it could have been.
The "create what you want writing it" thing is cool to some extent; it could easily become boring and, when rapid action is needed, you would probably create something basic just to solve the problem quickly. Otherwise, you would smile two or three times creating absurd things, then the action will become very repetitive. In the end, also language understanding problems by the AI will prevent some of your fantasies to be created in the game.
What about the DC Universe? On the one hand, the game has an enormous library containing almost all of the DC characters, the most strange and forgotten ones too. That's cool, but... on the other hand, the narrative is very basic and not only made for chidren, but actually childish and sometimes annoying. So, if the game is made for (quite stupid) children who probably haven't a deep knowldege of the DC comics, why is this enormous fan-service library provided?
...who is this game for, exactly? I can't say, but probably not for me.
Try it at the lowest price, just to satisfy your curiosity: 6-/10