I wouldn't necessarily know what fast-casual means but the first thing I noticed about Woodlands was that it was the closest thing to an Indian fast food joint that I have ever seen. The menu is posted overhead, the cashier takes orders and you pay before eating. When your food is done it is brought out on Styrofoam dishware to the table - not necessarily at the same time as that of your dining partners.
The pros: the food was all delicious. We ordered sambar dosai, an utthapam and a thali and all were of excellent quality. The chutneys are next to the serve-yourself drinking fountain and plastic silverware station so you can have as much of the (very tasty) chutneys and pickle as you wish. My sister requested no onions on her utthapam and they had no problem with customizations. The cashier was very friendly. Without any other service, no tip was needed.
The cons: the ambiance is definitely lacking as is the use of Styrofoam and plastic. If the prices were significantly lower than average I would say that it was worth the spartan aesthetic. However, the prices compare to those of most Indian restaurants. If I'm going to pay the same as elsewhere I would appreciate a more comfortable and attractive dining room and real dishware and eating utensils.
Overall I really enjoyed my food at Woodlands but perhaps I'd choose to get take-out next time. Then I could eat my dosa and sambar on dishes that didn't squish in my hands.