James Archer writes about the Hamburger Menu:
As an industry, we had somehow gotten “confusing and difficult navigation” mixed up with “fun and engaging user interface,” and convinced ourselves that people would put up with frustratingly vague navigation because it was cool and animated. It took a long time for the industry to finally break that habit.
I feel like I fight this battle with every new design concept comes my way these days, and rarely is it done with user experience in mind. More often than not, it’s put in place to satisfy multiple stakeholders who all want their pet page/project front and center. Out of options, the designer chooses a hamburger navigation option to appease all involved. The user doesn’t win here.
Mr. Archer gives a lot of good examples of why this style of nav is rarely a good idea, as well as a few good solutions for simplifying when you’re on a mobile layout. Definitely worth a read.