When someone says, in response to anything, be it movie, game, book, play, whatever, "It wasn't trying to ______". Yes, there are situations where leaving out an element of a play or game can be beneficial. Scott Pilgrim would not have been nearly as good as it was if it had tried for more mass appeal, and Half-Life and it's children wouldn't have been as tightly designed and fun to play if they had tried to allow for extra features like multiplayer. However, when I'm talking to a friend and they respond to my complaints about a film's lack of characterisation or a book's lack of coherent narrative and they respond that those things weren't what they were "trying to do," that doesn't make the book, film, game, whatever any better, it just shows that the people behind it were lazy.