Legend starts off with some potential, but the potential is lost within a couple of chapters. First off, the two main character have inhuman abilities and are both stunningly attractive and are perfectly fit, while no one else has any unordinary abilities (although some are "attractive" and fit). Usually, I'm fine with main characters in books having special abilities and looking well, but there is a limit to what any human can do and look like, Day can jump out of a window three stories high, survive, then easily run. He also having perfect teeth while living in the slum where I doubt dental care is important. June for example is getting stabbed in the side, but just having little pain and not much more and still having beautiful complexion. Another thing is that Day and June are very alike. Same reactions to events, and similar background events. Day, a rebellious teen, causing trouble within the "republics" has a brother with a Disease and is doing whatever he can to protect his family. Day is also very intellegent, and scores a perfect score on his test. Both parents and a brother end up dead. June, also a rebellious teen, is in school training to go into the army. June is also very intelligent and, like Day, has scored perfect on her test. Her parents and brother are dead. Some differences are that Day has a little more emotion. Another thing, is that it is somewhat clichéd. It is not as bad as some books, but still isn't very original. The un-clichéd part is the country split in half and a lot of talk about the government. But the rebellious teen, the romance and the betrayal is all to familiar.
Many people have fallen "in love" with this book. I can't really see why, but just give it a try for all you know, you might just like it.