I will admit my experience eating banh mi sandwiches are limited, but I had enjoyed the few I have tried at Lemongrass.
This was a completely different experience. The bread is really good but everything else I found really bland and awful. The charbroiled chicken didn't seem charbroiled at all and was flavorless. The beef was worse, amazingly enough. The vegetable offerings in them were puny and not flavored as well as I had experienced at Lemongrass.
While this place is a good option for Banh Mi's in that they offer delivery through roadrunner, and the bread is good (gave them a star for that), I really think that this was again, another over-hyped Spring Mountain establishment that really was awful.