Ok, I'll stick my neck out and risk the flames.
From what I can see, the main complaints about the AR-15 are;
1. Caliber related (which is supposedly thrown out for the sake of this thread.)
2. Reliability of the rifle.
3. Design flaws.
4. Lack of range and accuracy when compared to the M14 or other .308 rifles. (this is really part of problem number 1.)
To address 2 first, the reliability of the rifle is always mentioned in the same sentence with "as long as you do your part."
Well what makes this different than any OTHER firearm?
If you don't take care of it, it won't take care of you. Is the AR harder to maintain than the M14? Well, I own both, and serviced both as a Marine Armorer and I don't see a lot of difference from the user's perspective.
They're both a PITA to clean.
3. Design flaws?
The only thing I saw mentioned as a design flaw was the gas system. It's not a "flaw" if it works, and it DOES work. It may not be your favorite flavor of gas system, but that doesn't mean it's flawed. What other flaws do any of you think there are?
Finally 1 and 4.
Power, range and accuracy.
Well yes. the .308 is more powerful than the .223, but on th other hand the .308 is a serious wimp compared to the .460 Weatherby Mag. What's the point?
Getting shot is getting shot, and I don't think there's ever been a case of someone getting hit by a .223 and immediatly saying with relief, "Thank GOD it wasn't a .308!"
Range and accuracy?
The black gun is now beating the PANTS off of the M14 in long range competition and now dominates the 1000 yard range.
True, you have to do a lot of mods on the AR to get it to DO that, but a stock, service grade M14 ain't gonna be in the running for 1st place either, ya know?
Will the .223/5.56 kill you just as dead at 1000 yards as the .308/7.62? Probably, but I won't volunteer to stand out there and be the guy to find out!
The AR-15 was designed as a battle rifle, and once "the facts of life" were figured out, it's served VERY well in that capacity.
If you don't like it, that's fine, I personally hate SKS's and AK47's.
They're good for what they're intended for, I just don't like'em.
But I give them the respect they're due.
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Your mind is your primary weapon.
USE IT!