The latest iPad is so much better. So much more response, you can have 2 apps open at the same time. Web pages are fast and iOS is really snappy. Also, touch id which I always saw as a gimmick turned out to be the handiest thing ever. I now sigh when my thumb doesn't unlock my phone.
The only thing that niggles me a bit is I feel the life of the iPad2 was cut slightly shorter by Apple and it's iOS updates. iOS7 killed the performance. It shouldn't really have had the update or any update after. I am still not sure if Apple gave delivered iOS updates to avoid fragmentation or to slowly kill of the device to encourage new purchases.
I am not convinced either are valid reasons considering the degradation in performance of an otherwise pretty good device.