Definitely a good bang for your buck. For the food you get to how much it costs, I would give that around a 3.5 - 4 star.
In terms of straight up quality, I would give it a two. There really is nothing special about the food that they provide. I'm not saying it's bad, rather, there's nothing that really makes you say "wow, that's really good." It doesn't really make you have this urge to come back the next day and have another.
If you're in the area and need something quick to eat, then Banh Mi Boys is great. If you're looking to experience asian fusion at a higher level, then there are other places that do it better.