I feel that if your squatting with proper form and all the way down you are truly working your legs to failure. I used to squat half ass. Sure I could rack 3 plates on each side but for what? I couldn't perform the proper form with it and my legs grew but eventually stalled and peaked with that performance. and I never really felt that much stronger in the lower body category neither.
It took me a while but I finally achieved proper 100% form and I had to leave my pride at the door for reaching such. But I feel so much better with a little of patience and look even greater in the leg area.
Lesson learned, it's not about the weight you lift. It's truly about the form. I can bench a plate and 25 on each side for 20 reps but at the end I look so much better then the guy next to me benching three plates on each end for 1-2 reps. And I can speak for a good chest because I feel it is my best feature. And I've never been able to break three plates for more then 6 reps.
Leave your pride at the door gentleman! It will certainly help in many other areas of life outside the iron jungle.