maybe they shouldn't have upgraded their old ipad to ios9. our at least waited until apple worked out all the bugs first. just because there is a new os, doesn't mean it's better than the old one. often the new os isn't tested probably on older devices, and Apple know if you get frustrated with the old ipad that used to work fine, but now it doesn't because of their upgrade, you'll just have to buy a new ipad, because there is no way to go back to the old version.
PS, had you bought an Android, you wouldn't have this problem, because with Android you can always flash any os version you want, so if you aren't happy with the Lollipop upgrade, no big deal, just reflash it back to KitKat, and keep using your device.