Noobie seeking advice from experts

leg extensions place more stress on the anterior cruciate ligament than squats...and are not as functional as squats, as they don't duplicate the weight-bearing, synchronous multi-joint movements associated with sporting activity

leg presses are just bad for your back

Squats are the king of strength exercise for the lower body, when performed properly that is. That said about squats I don't know what the long term effects are on the spine. It doesn't seem to me too good an idea to compress your vertebral column day in and day out with hundreds of pounds of pressure.
 
Yeah. alot people who preform the leg press let their pelvic "tuck under" at the end of the movement, so the knees almost hit their chest (if they are doing the vertical sitting leg press) it hurts just to look at..
 
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