The LEGO games were better when they didn't have any dialog. They had to be way more creative in their storytelling. I tried playing some of the newer ones and hearing actual dialog just seemed wrong.
The game is full of npcs that talk. With speech bubbles and all. The entire game design has changed, and mumble mode won't recover that.
Also the gameplay itself is non-existent. I bought the new game expecting it to be similar to those of my childhood, they have nothing in common, only the name.