Having spent many years in Chennai in the past I can quite believe the stories about how kind the people of Chennai are. In fact, I have heard similar stories from others about the city!
The biggest complaint about Chennai from non-Chennai-ites are firstly the unbearable heat in summer and secondly the language problems (if you ignore the perrenial water shortage). “If you can’t speak Tamil you are in trouble” seems to be the common complaint. Not sure how it is these days. My personal view is that Chennai is a lot more cosmopolitan than it was in the past. But can you get by easily in the city without knowing Tamil? Will the autorickshaw guy take you for a spin around the city (when the shortest route to your destination is just a couple of Kms away!) even if he understands that you are an outsider with no knowledge of Tamil?