I'm highly familiar with India. So, keep the following in mind:
(All of this is w.r.t European cars in India; situation is different for Indian, Japanese, Korean, and American car companies)
1. Cars manufactured in India (including Mercedes/BMW/VW/Skoda etc) are set up for right hand drive (steering wheel is on the right, and cars are driven on the left side of the road).
2. For high end brands you don't get as much configuration options as in Germany; limited choices with interior materials and colour. The flip side is, the time from booking a car to its delivery is relatively short, provided you buy a model that's relatively widely sold. ie., a Mercedes C200 shouldn't take too long to deliver. But the AMG models might take longer.
3. German cars are crazy expensive in India.
4. For most German brands, the parts are imported from Europe and assembled in their plants in India (this is called the "CKD - completely knocked down" route). Would be inefficient to then move that car back to Germany.
5. Higher end German cars (like, BMW M models, Mercedes AMG models etc) are directly imported into India from Europe. Direct imports have extremely high taxes. Again, would be inefficient to ship it back to Germany.