My $.02 worth...
My "L-dub" M6A2 has been my go to weapon for the whole time I've owned it (8 years). I owned a SCAR-L for about 3 months and to be honest, it didnt do anything more special or spectacular that the L-dub. Both being piston rifles, the internals stayed very clean and I had no problem with either. What sealed it for me to get rid of the SCAR was it wouldn't feed the steel case ammo that I bought. Out of 500 rounds fired thru each gun, It was only 5 failure to fire in the SCAR, but 0 my L-dub. I know what you're thinking, it was the primer on the rounds. Surprise, the L-dub fired the five rounds the SCAR didn't.
As far as AR's not being accurate or reliable, I've built 6 and all of them run like a nose in January. My suggestion... Have someone build you a good gun or like it was suggested... STOP BUYING JUNK