It allows for two types of missions; Batman and his acolytes as well as all (or almost) villains Batman stories. This considerably increases the duration of the game and his interest (in free play, you can play with the wicked and Batman together)
Obviously, the ideal (and the clear advantage of the game) is to share this game with 2 players ...
Point negative, do not expect the game to have to solve tricky puzzles.
Graphically, no changes (in the meantime, this is Lego) so all looks like a cartoon in a 3D setting.
In conclusion, Lego Batman is a game especially for young people between 7 and 12 years, wanting to play with these friends or those siblings and adults wanting to share something other than bastons and / or war games (careful anyway to small disputes that may arise).