I love Batman. I also love the Lego games (except Indiana Jones), so the first Lego Batman was great. This was actually much better. Lego is now putting Dialogue in their games, which works with their sense of humor.
The open world feel of the levels is a definite game changer for them, and it completely works. Even as a Lego, you get to explore Gotham City and fight all types of villains in order to unlock them. The heroes must be unlocked by finding gold bricks and building their doors in the city. This is great because of the challenge it presents to go back to the old school ways of platforming to try and convince the player even more to explore levels more in order to find everything.
The story line is really good, and the controls feel much better and smoother than in the first game. All of the cool characters return from the first, but the lineup is expanded with the Justice League lineup. In the first game, Batman had to "work" alongside his criminal lineup to complete challenges in the levels. Now, Simply call on Superman to use his laser vision to heat something, or Cyborg to lift something up. It really brings out the comic book in all of us.