Maybe I got them on a bad day but I didn't enjoy their khao soi.
"To get a sense of the dish’s Chinese-Muslim origins, head to the bustling, canteen style Khao Soi Islam, where the broth is light and the noodles are spaghetti-like."
— From Guardian article
Must try the khao mok neua (ข้าวหมกเนื้อ), or Thai style beef biryani rice.