Just like in biology, form fits function. Good form, you have a functional lift, you have functional muscles being built. Terrible form, you have terrible function, and probably injury. People want results right away, but to really see results, it takes time. Just like anything worthwhile, exercising is an investment. When I joined the crossfit gym, I knew it was a good one when the owner asked me, "are you sure you want to do this? are you sure you want to invest the time into this? if you're going to come once/week or inconsistently or if it sounds too intense, this may not be right for you".