1) Management is worst.
2) very less salary hike.
3) No job security. If your performance not better for even 8 days they can relieve you.
4) No personal life , you must have to be available for 24 by 7 and even on weekends.(without any compensation)
5) No value of your hardwork.
6) very poor management for leaves, again they can dismiss you if you take more leaves in month.