It's an okay choice, but lacking in power for hunting and scrounging ability.
First let me say that I'm not the greatest fan of the AK platform.
However they generally are fairly accurate, reliable and reasonably inexpensive.
One reason I don't like the AK platform is the inability to rebuild with only a few tools. I can take an AR or FAL apart with a few hand tools and a vise and replace or repair pretty much anything on them and have.
The decision to depend on foreign made ammo in a crisis is not the most healthy. Unless you are able to stack the ammo uncommonly deep, you may find yourself without bullets to defend your beans.
Not living in an urban area, I have to consider food procurement as well as defensive shooting. The 5.45 round is lacking in power when looking at Deer, Elk and other large critters (slow Elk). Talk about bullet tumbling all you want, I can't depend on that happening every time and in every critter (or person).
My personal choices are the .308 (7.62 Nato) and the .30-06.
While there are few good semi-auto's today that are chambered for the .30-06, the .308 is chambered for most. And excellent, durable, long lasting, bolt actions are chambered for both.
They're available basically everywhere, even out here in the sticks. I can go down to any of the hunters/shooters in town and they're all gonna have .308/.30-06, at least a few rounds unlike the 5.45 round.
I've used, owned, built, worked on and carried most of the "AR's" out there.
My personal choice is the FAL platform and the .308 chambering.
The FAL is more ergonomic for me than any other weapon.
Accuracy is one of the factors too many people make too much of.
If you can keep your shots in 4" at 100Y from any position (within reason), you're gonna bring home meat or make it through a shooting.
If you can shoot a 1/2" group from the bench but can't keep it on a sheet of typing paper or paper plate at 100Y (or shorter) you're gonna be kitty litter.
Realistically, any good quality rifle that you can "run and gun" is a better choice than some wonder blaster that you can't use effectively.
Leverguns, bolt actions and such are all good choices, depending on your needs.
There is no perfect, ultimate or best rifle for everyone out there.
Just the best for you.