With respect to AR and AK abuse, anyone remember seeing the video of the Taliban fighters cleaning their AK's? One of them stated that they were cleaning their rifles because they wanted them to function when they met up with the Americans.
Any rifleman worth his salt is going to clean, lubricate, and take care of his rifle like his life depended on it.
Also, if the Taliban can manage to find time to clean and lubricate their AK's in Afghanistan, a county that arguably doesn't know WTF SHTF means, given that every day there is pretty much SHTF, I'm pretty sure you can take five minutes to clean and lubricate your AR or AK.
As far as the accuracy of the AR platform or the inaccuracy of the AK platform is concerned, the accuracy standard for a military AR or military AK is exactly the same, 4MOA at 100 yards.
If you can hit a saucer at 100 yards, whomever you're shooting at is going to have a really bad day. Either weapon is more than capable of hitting a saucer, so the accuracy argument is more about making nice groups on paper than what matters when someone is shooting at you.
Use quality springs and magazines in your rifle. Poor quality magazines and poor quality springs can and will cause failures in ANY rifle.
The AR and AK designs have been around for more than fifty years now. If there were a major design flaw of any kind with either weapon, we would know about it by now.