I'm a well read grad student who's bluntly honest about all things, although I try to be most honest about myself.
Why are Harley Quinn and Poison Ivy in a superhero school? I don't know. Some villains are still villains and some aren't. Harley Quinn in particular seems an... odd choice. Popular, yes, but it just seems odd to include her, especially since they defang her completely. She's the class clown, smart, but doesn't seem to have a mean bone in her body. Poison Ivy will do anything to protect her plants, but doesn't seem to hate humanity at all.
And the characters all seem flat, and furthermore nothing like they really are. This is a cute story and some of the things it teaches - like friendship and being honest is good - are told in a fun way. I think it's a pretty good thing for younger kids, but it's just annoying that they betray the characterizations like this. They might as well have used original characters at this point - although that wouldn't have the name recognition. That gets more children reading this, which has good lessons for children, so it serves its purpose - and also seems like a grab for cash with all the dolls and stuff that really only teach kids about buying things.
So, eh, conflicted, so two and a half stars.