Indian buffets are wonderful for vegetarians, they're a nightmare for vegans since American-Indian resturant cooking is loaded with every kind of dairy imaginable: yogurt, butter, ghee, and cream is in everything. Like you can't even have the naan at most places.

I will say it's an improvement on most restaurants simply because you can actually find naturally vegan options that aren't a sad salad but its tough otherwise since every place is different and uses wildly different recipes for a given dish.