As a recent  convert to Indian cuisine take my opinion with trepidation for the experienced or enthusiasm for those who've been missing out.
Built within an old Chinese buffet, India House style fits in comfortably into the old floor plan (with some East Asian motifs still filtering in) with a decent buffet and absurdly large dining area.
First experience was with the very affordable buffet. Selection was more than adequete and a never ending supply on complimentary Nan made it all the better. It is a buffet so adjust you expectations accordingly.
However, arriving for a made fresh dinner is a whole different ball game. Ordered the Kadai Chicken dinner; which was phenomenal. Not much else to stay but check this place out.
The people who say that the best ethnic food these days is in strip malls were right!
We found India House Restaurant on our way back to Chicago from Holland, MI. And I don't know about you, but after a weekend of the fine fare at the xmas parties of Holland, MI, we sure needed a refreshing change, and India House Restaurant fit the bill: we had spicy, diverse food that satisfied meat-eaters and a vegetarian. The buffet was fresh and well-stocked. I tried several preparations of chicken (ticka masala, tandori, and one in a chick-pea curry), as well as lamb (the meatballs were particularly good).
Looking around the restaurant it occurred to us that India House Restaurant had taken over a Chinese buffet, painted a wall orange, and called it a day. I spoke with our server and it turns out that this is exactly what had gone down. They'd been in Michigan City for just over a year.
Again: the food is excellent. Totally worth a trip if you are on the road, and if you live nearby try the non-buffet menu (which we didn't try).