I've been to Jatujak over the past 9 months with various reactions. Usually the service is quite good and the food authentic and nicely prepared. The space is nicely decorated with an authentic touch!
Food: Their Mango Salad is really very good. The Fried Fish is generally good but my last visit was not well cooked, resulting in some pieces raw. The Tom Yum was not as good as usual this last visit. Having tried a variety of items from the menu I feel that as they are getting more popular and thus busier it is not quite as consistent as when they first opened.
Hope that they get on top of everything as they grow as a business as there prices are fair and service is good.