They are very reliable, but not especially accurate. But you can usually get it down to about 1.5-2in moa or better .by doing some adjusting. By weighting the barrel with a recoil eliminator it will help a lot. Plus there are gunsmiths that will help the trigger for about $50. They are also bullit sensitive. Mine likes light bullits.
If you google mini 14 accuracy you will get a lot of help. And I read in forum posts that lots of ARs are not so accurate unless you want to spend $1k +. Its not a bad gun, I've had mine for 25 years and shot it a lot, never has jammed.