My lunges are not so great, either!
Luanne
I don't advocate doing legs daily!


What an inspiration you are!
You can't compare the weights you can do with regular squats to your hacksquat weights - they're apples and oranges.
BUT the most effective one for the butt and thighs. Very few of my female clients can do any weight at all on it -- don't forget that the sled itself weighs a considerable amount (probably at least 40 pounds on the one in my gym). So if you're doing sets on a hacksquat machine at 0 and 10 pounds, you have nothing to be ashamed of!

Most of my clients don't do any weight on the hacksquat machine either.
Unless it just means that I have a really strong -- as in ENORMOUS -- butt! 
!