This is not nearly accurate. NDTV "and others"(not sure of any other mainstream channels) have also hsitorically been hard on the UPA governments even if you consider them pro-Congress.
The current breed of mainstream channels (Zee, Republic, India) who hold most of the eyeballs in India are not just pro-government they blatantly lie to protect the government's incompetence. Added to the fact teh BJP is a top advertiser on TV media creates a dangerous incestuous relationship the scale of which we've not ever seen before.
Check out the analysis of 200 prime-time debates done by peeing human. Republic, India TV, Zee News, ABP News, Aaj Tak, Times Now, Sudarshan News and countless regional channels are pro-govt. NDTV is the last channel standing.