Q&A/Cortana works really well on certain datasets. It is very janky if your data is less presentation-layer-friendly.
I've already used QR codes to show off some data to colleagues, which went over much like a magician's magic trick. Many ooohs and ahhhs when you show off easy mobile integration.
The new mobile layout feature is pretty hot, because it lets you design a report to look a specific way if you're viewing it in portrait mode on a phone/tablet. Glad they added it.
I've been wearing the integrations developer hat for a while, so I don't have many more fun visualizations to show off at the moment. I will say that it's been fantastic for "Yeah, I'll have it ready by this afternoon." data discovery.