I've been to Mostly Thai a number of times over the past 3 years. Their menu makes my mouth water and it gets hard to decide, because there are a lot of choices. The menu is available on their website. I've tried several dishes, and all have been good, but my all-time favourite is Eggplant in Red Curry (choice of beef, chicken, or shrimp, $9.95). I always choose beef for that dish. An acquaintance stands by their Pad Thai. The menu indicates which dishes are extra-spicy, but you can request a dish be less or more spicy, according to your taste or courage.
The decor is low-key, and there is a second dining area which is very suitable for groups. Service is generally quite good, but slightly slower if the dining room is busy. This is a good choice for excellent Thai in a casual dining atmosphere. There's enough variety on the menu to please most people.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.