I have many $4-500 AR's with more than 5k down the tube. Replace the barrel every 10-20k rounds and you're good to go.
One of the machine gun ranges kept track of round count. The AK's were beat, stretched, cracked, etc by 100k rounds. They had AR's over 250k, still working. They did have to put kns anti-rotation trigger pins in to keep the pins from falling out around 150k rounds.
The AK works generally. It's not magic and still takes maintenance and replacement parts or it will stop working.
The main thing keeping me away from any AK is the complete shit show in the ergonomics, coupled with the fact that it was designed for someone about 5'2" tall.