Squats are KING of leg building...
I will attempt to give the long and short version of leg training here.
If you want real mass and size on those legs of yours... if you want to develop mammoth tree trunks that cause onlookers to gaze in wide mouth amazement, then my friend.... don't shy away from the squats... they are KING in leg building. If you speak to any seasoned bodybuilder in the sport, they will invariably say that squats do the thing that no other exercise can.
When going down into the bottom position there are a couple of things that you should not do. First, descend all the way until you butt touchs your heels. Second, don't bounce when you are that far down, regardless if you use wraps or not, you will destroy your knees.
The preferred method of squatting is descending only to the point of only just below parallel.
Having said that there is another exercise that will be of benefit to you if you don't like this... the 1/2 squat... you perform it exactly the same manner but it allows you to use much more weight. Remember, follow strict form always... yields much greater results.
Maxmuscle66