OK Jbum...I'll bite.
Sure they're great for smurfs and internet rangers.
Comfort and proper weight distribution were not considerations in ALICE pack design.
Unless you are 5'4" tall.
Check Backpacker magazine, then go try some on.
Proper fit to your torso length is crucial, so the belt hits your hips to take the load off your shoulders (and back).
Next check that the belt and shoulder straps have good padding.
I have an external frame pack designed by Sportsman's Guide. It's big, light and well organized.
But most people want internal frames for no good reason.
I am not the tallest guy nor am I blue (at the moment) so for this internet ranger, they seem to work well for me. I have changed the straps BTW and it wears well for me.