The only problems i ve noticed in the new city are:-
1) hits almost every 2nd speed braker
2) On CNG, the petrol fuel guage wont show any fuel in the tank.
3) Cramped space inside compared to previous shape (idsi)
3) Black interior is too hard to maintain
As for the ppl complaining about the quality of interior, 95% ppl say that JUST because interior is white and they think its supposed to be beige/brown. i ve compared the interior quality of a friends 2010 city and my idsi 2006, i found that atleast, atleast it was much better then the interior quality of city. i mean my cars' front doors gave a very bad sound when closed, from day 1. But new city gives a heavy door closing sound. I tried to press the plastic on doors with my thumb, if i do that in my car, it produces squeaking sounds at various spots, there wasnt a sound in new city though.
So overall, i wud say that the biggest negative point of new city is the cabin space is less then idsi. although its still enough for me (6') but in my idsi, i enjoy the FEEL of open space.that feel is just missing in new city.apart from this, each and everything is better compared to idsi.