Whatsapp has been and still is the most popular chat apps in Android and IPhone.
It’s not too advanced with lot of difficult features and not too basic with none. It comes with the right amount of features for someone to get addicted to.
Yes, I agree that there are problems in every update of the app, what makes me wonder is that the employees persistence to neutralise the error every now and then. even after the facebook has purchased it, The quality is as good as if not more than before.
One of the rumours is that the app Whatsapp causes heat in the Smartphones, but I never experienced it.
One of things is to note is the call button, It is right next to attachment button, This can cause unnecessary calls to other people which may disturb them. That is only drawback I can think of. If Whatsapp can correct this, I think they will be near to flawless