WhatsApp is awful. Why should I need to give my phone number to anyone I want to chat with? There is people with whom I might want to have a text chat without letting them call me, and vice versa. And why, in 2014, should a social account be tied to a particular device? Why doesn't WhatsApp let me use my tablet or my PC to interact with my friends?

If WhatsApp is an example of something, it's that the network effect can make inferior technologies "stick" and dominate markets over much better competitors.