I also agree with Big E. The AR is a handy, flexible, highly configurable rifle. It's very easy to build to your exact specifications, the hardest part is making the right decisions the first time around. There are very few firearms that are as easy to upgrade and customize without the need for a large tool collection or a gunsmith.
I also bought stripped lowers locally from licensed FFLs with typical firearms background checks then had complete uppers and other parts delivered from BCM, Daniel Defense, PSA and other quality vendors. If you do your homework you can expect the rifle to work as well or better than one off the shelf. However, for folks who want a factory model, there are more configurations available than ever.
Something else to think of, there are dozens of calibers available and lots of built in accuracy and reliability. And 5.56/.223 is inexpensive compared to other centerfire rifle ammo (about .25-.50 a shot) so you can shoot a lot and store a lot. Many of us take advantage of sales and buy a thousand rounds at a time - or more.
For these reasons, and no doubt the sunset of the AWB, interest in the AR has skyrocketed in the last five or so years. And quality today is better than ever.