If u r using lumia 535 then you have to face the camera issue.
I always get complains of its camera issue.
Many time the camera does not open . and I habecto restart the device. which is very bad bug of this phone. anf if you r facing this prblm then u have to update the softwere or u have to go service centr. so I thing this is a huge negativity. and except this . lumia 535 have an another touch issue.
Frm a frnd I got a complain of touch issue. but I dont feel such . but letr microsoft accept the camera and touch issue.