I happen to be a huge fan of Japanese ramen and let me start off by saying that I've been blown away by some mean bowls all over the world but Muku isn't even close to making my memorable list.
Broth - no complexity in flavor
Noodle - Do they even make their ramen noodle from scratch? I expect this to be a must for a noodle house. There was absolutely no 'marriage' between the noodle and the broth.
Toppings - Dry, flavorless and boring overall
Honestly, home made ramen can taste much better than Muku's. Sorry.