I am surprised by these reports. I have been using DishTV for the last two odd years, and have never had a any issues excepting in deep monsoon season. Even when there are dark clouds I get clear signal. When it rains heavily, of course, I don't expect any signal and disconnect my system it protect to from lightning.
I have heard of people buying the set top boxes and enjoying Indian DTH systems in Dubai, Singapore, Malaysia and other nearby countries. So you should be able to get good signal in India. Just ask your supplier to come and fine tune the reception. The antenna has to face the geostationary satellite exactly. At those distances, even a few degrees here and there, and you will miss the signals completely.
DishTV's rude customer and their constant price increases are a different matter altogether.
Cheers