I supposed it's good to have our expectations checked when updating the iOS on these yesteryear Apple devices.
No doubt the iPad 2 has long past its due time but still, having own 1 myself, I gotta say, I'm loving it a lot, more so with iOS 9.3.5, which is the last update available for iPad 2, unfortunately.
It was much laggy, even with simple typing, on the iOS 9.3.3 but now, it is much smoother, considering my use of it is more on the productivity side.
p/s: I, for one, do secretly wish that the iPad 2 will receive the iOS 10 update though, despite the specs of the device.