Sure, COG is a bit later then expected with this review, but they think they have something to say about how Luigi manages to change what fans of Mario’s game have come to expect.
"Any Nintendo fan knows that 2013 is the “Year of Luigi”, and to continue the celebration of the green-hatted plumber New Super Mario Bros. U has been transformed into New Super Luigi U. This is not a new game per se, but it is a transformation of Mario Bros. U that was launched during the Wii U’s release. So, does Luigi manage to take the spotlight and show those Mario fans out there that he can star in a game that is just as enticing and fun to play?" 77/100