Two days ago I got 7 legendaries with only around 3 hours of playtime. I have not gotten any legendaries since then although I have played over 5 hours.
Anyways that's a small example. Point is you have lucky streaks and you have bad streaks. You also tend to notice the bad ones more. People have been posting topics like these daily on days I'm unlucky and lucky so yes many are frustrated when they see more of these topics. People have posted this same topic when you were supposebly getting legendaries. They are simply false.