I'm not arguing what should be more popular.
The message in MindGame can be easily misconstrued due to it's different style. Where as in Baccano, or say, Tokikake, there isn't much room for confusion.
Mindgame is a beauty of a movie, granted, and I don't want anyone to feel like their part of some elite society if they understood what the director, writer or whoever was telling the audience how to think, but the movie's main message isn't really a big hit with larger audiences. Therefore, it's almost a swing and a miss.
Hence, the "somewhat valid" statement.