The first time I heard about Nirvana 2 was from a colleague of mine who loves Indian cuisine. Now growing up in a family of Indian chefs and doing my own Indian cooking there was only one restaurant that I like to visit and that was the Rajbhoj in the university area. When I first went to check out Nirvana 2 I was pleasantly surprised to see that the owner was also a chef at Lolas making the lolas beef tips. If anyone has ever tasted the Lolas beef tips it is also close as you get to original Portuguese cuisine.
Now about Nirvana 2;- it is more about carrying out than dining in. Once you set that expectation you would be fine. Another thing to keep in mind is that not all Indian food is spicy. Anything that involves cream will be bland for the most part. What the reader Avi A said about the food being bland;- any lentils or korma will always have some blandness associated for it. If you want something with a flavor and a kick here are some options;-
Chilli chicken
Pepper Chicken
Any south Indian chicken
Curry fish - Yes this is really good
For you non vegetarians;-
Chama masalla
Any peas and mushroom combinations
Any kadai combinations
The coconut chicken is also good but dont expect it to be spicy.
The staff is very friendly and they do take feedback. So if you have to say something tell them. It will only help improve their cusine. My mama always told me that if you dont have something nie to say dont say it all. And if someone doesnt like the food they can always cook at home =(^-^)=!