I had the iPad 3 and 4. Both were phenomenal. I decided to give the nexus 7 a chance to see if it could be an alternative to the iPad mini Retina.
It wasn't in some key ways, with on the more egregious issues being random reboots and netflix freezing at random times.
Then there is the 7" display with a 16:10 aspect ratio. Together the combo is not as pleasant for browsing and reading, and add to that there is a nav bar and status bar eating screen estate and your display is closer to 6.5 inches.
The cameras are also atrocious.
However it's sounds great, feels awesome in the hand, has an awesome display and is deceptively fast given the old tech under the hood. It's also so cheap you don't care about throwing it in a coat pocket or in a bag without 60 dollars in screen covers and cases.
The battery life is also surreal. I watched a whole season of Sons of Anarchy on a single charge and the video quality is excellent. The display is also super bright for a tablet, but the black levels were so so. The sound was very spacious sounding and immersive as well.
As a bedside music player it was better than my iPads too.
It's a close runner up to the iPad Mini retina, but not better to me, but that cheap price is a nice perk.
What I would really like to see is the nexus 7 type device running Windows Phone.