So I just bought a WP8 and I have to say that reading all these comments on how badly WhatsApp works really scared the **** out of me. But after using it now for about a week, I honestly don't see why everybody is complaining. I almost didn't buy a WP8 because of it, but it works surprisingly good. Notifications work perfectly, the live tile shows exactly what it's supposed to show and the messages get sent instantly and I have 0 problems receiving messages or pictures. I don't understand all the negative reviews, or did I just get really lucky to get a perfectly fine working version of WhatsApp on my WP8?
To anyone reading this contemplating buying a WP8, but is scared to do so because WhatsApp is an app you use frequently, don't be. It's working fine, better than on my Android, where I received messages 15-30 minutes late every single ******** time.