I have to agree with bignate. How often in the real world, or even in the sports world, do you put a metal bar across your traps, with your feet evenly placed, dip down to where your thighs are parallel to the floor, and go back up, several times?
I did single leg squats yesterday and today I am sore in places that were never sore from regular squats.
I will never give up squats completely but I am glad that my current situation forced me to find this alternative.
You might say, OK, when in real life do I ever put one toe behind me on a bench, grasp two dunmbells, and squat down several times, then switch legs and do the same.
So you can make the same argument against one legged squats. I think all you can say is that one legged squats are different, not necessarily better than reguar squats.
JC