You have been listening to too many Apple haters and bashers on YouTube, again, haven't you?
I still have my original iPad 1 from 2010 and while I can't update its iOS any longer, I still use for many things because the apps that are on it, while older, still work!
One thing my old iPad 1 still does that Apple removed in later versions of iOS is that I can stream ALL of my iTunes purchased movie content from a remote, local storage device.
Can't do THAT any longer with any iDevice running iOS 8 and later.
You may have some hardware and/or software issue that slowed down your iDevice.
I have no idea how you upgrade/updated all your iDevices, but I suspect you may, at least, once updated/upgraded over the air using WiFi, which in most cases I have seen here in these forums has not been a reliable way to upgrade/update these devices.
The Wifi upgrade/update path is less reliable because Apple servers will attempt to analyze your device and only download what the servers think you will need for the upgrade/update.
I always update/upgrade all of my iDevices connected to my Mac running the latest version of iTunes.
That way, iTunes will download the full iOS upgrade/update and my iPad will get only what it will get from that entire full iOS download based on what it is capable of receiving.
The whole upgrade/update process takes longer, but is a much, much better and more relIable way to be able to ensure that your iDevice receives ALL the proper data from an iOS upgrade/update.
Anything else you like to add?
Again, millions of users still using older iPads (maybe not so many still using older iPhones) that are still going with no issues.
If all the iPad 2, 3 and 4 users all came telling us there iPads were no longer working or are working very poorly, we'd see A HECK OF A LOT more postings here in the forums.
Those that don't have any issues with their older iPad models don't post in troubleshooting forums, such as these.
Those that have have been pretty vocal, like you, about how their iDevices/iPads havd been running poorly on whatever new version of iOS gets released.
I am not an Apple sheep, and I find your term fanboy insulting and derogatory, btw!
I don't like iOS 10, pretty much, at all.
I have two newer iDevices that are staying put on iOS 9.3.5.
I am not like most users who feel the need to upgrade/update my iDevices every time Apple releases a new iOS upgrade/update. I wait it out until all of the bugs, kinks, more or less, get ironed out and/or there are compelling features that maybe worth an update.
So, I see nothing of value in iOS 10, to date.
So, I wait. I never did install anything from iOS 8 because I hated everything about it! So, I skipped iOS 8 completely.
If iOS 10 doesn't shape up well for me and my newer iPad and iPod Touch, I WILL be skipping iOS 10, as well.
No problems at all with doing that.
I did it once, I can do it, again!