I've found Pho 99 to have excellent "comfort food" and fast service. True, it does get crowded at peak times, but the clientele is far from just WWU students. In fact, the customers are an eclectic cross section of Bellingham. It's location, just seconds off of I-5 should make it a convenient stop for travelers in addition to locals.
The food is super fresh, and menu has all sorts of options. Even the "small" portions are good sized. Not much on ambiance, and it gets noisy when crowded. Come for the food! Prices are very reasonable!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.