I would have to partially agree with him to an extent. I also believe that he is most certainly entitled to his opinion. I am entitled to mine and my experiences as well.
I have the AR-15, and AR-10, and an FAL. Mine are not safe queens, but get drug around, dirty and such. Not a problem yet, but I do admit that the FAL is easier to clean.
FWIW, I have found that most military people do not put enough lube on a weapon, especially an AR. A buddy bought an AR, and then had the jamming issue (former Army). I checked it and it was wayyyy too dry. Lubed it up properly and it ran fine after that. Oh, and a Garand is sensitive to the powder used in it. Use the wrong one and you will bend an op rod.
Is there newer stuff out that that may be better? Why certainly there is.