I think most of us can agree that the M-16 and rifles like it should not be our standard issue for the army. It is just not a battlerifle. It can't take very much abuse and the .223 doesn't go through much, while a 30-06 will punch through block walls with ease. Like you guys, I think shooting the AR is fun and easy, even on auto, but you wouldn't want to have to rely on it to save your life. Sure, this weapon has its place, like raiding houses and stuff at night it tight quarters, but only a couple guys in the squad should have one of these. The others should be equiped with something like a .308.
Slipdigit is right, after firing an M-16 on auto, an AK-47 is harder to control. I would still take the AK for its reliablility and knockdown power.

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Weapons are cool.