One of the iOS upgrades (7 or 8) brought massive performance problems, on a normal OS you would just downgrade but there is no such option on iOS.
Alternative browsers are also very slow, it looks like Chrome isn't able to take full advantage of V8. An Android device that costs less than a third than the iPad can run Chrome much better than an iPad2 can.
The iPad2 (WiFi) also has a GPS device, but it only works when you are connected to WiFi: I couldn't get it to work without WiFi which limits its usefulness. Android devices with GPS always worked offline, you even have the option to download AGPS data when you're connected to a WiFi to speed up TTFF, but even without that it works it just takes (a lot) longer to get a fix.
Try finding the equivalent of a commonly used application from Linux/Windows on iPad that isn't filled with ads, or limited features (unless you do an in-app purchase). For example is there a usable VNC client?
In the end the iPad is useful only for: web browsing (with default browser), reading emails, playing games. An equivalently priced Android device can be much more useful, and you have a wider selection of useful applications.
With all these problems I couldn't recommend anyone to buy an iPad (much less an iPhone), and I'll probably sell mine at some point.