I am tell you about not so good experience about delhi international airport. The security at this airport is crazy. You have to go through 7 to 8 security gates even before you gate to the check in counter of your airline.
We have 3 hours early arriving at the airport and staff are rude and ask personal question. Airport authorities must take step to make it passenger freindly rather than scaring them off by their employees and security. So I was very disappointed by airport staff behaviour.