I first started training when I was 16 years old, it has been 6 years now and I only consider my last 3 years hardcore crazy ass training.
When I first joined the gym I had an orientation by the trainer there and followed his guidelines. I gained some strength and my body was changing a bit. I was pretty happy with the results but it wasn't enough I really wanted to be one of the biggest strongest crazy mf's in the gym. I observed the freaks train at our gym, I bought as many training videos as I can. The freaks and pros claimed to be training with strict form but I was like these guys cheat a bit.
I believe in the beginning of your training life you should use very good form to learn the mechanics of the lifts and learn witch muscles are activated through the exercises. After a few years of training you will learn you will never get to those 85lbs dumbells on incline db presses if you somehow don't just get them up there and use them. I don't know how to explain it but you have to force your body in every which way to go to extremes in training, but I'm not saying to train like a moron I'm saying to have a balance between overload and form. If you have too much overload where your form looks like junk you will get injured and make no gains, If your form is top notch and you are never able to reach that next level in overload then you are also wasting a lot of time. I have seen people in the gym have size and use the superslow, super strict reps but if you take a closer look they stay the same for very long periods of time, b/c they never overload their muscles to the point where they are forced to grow. I have more to say but for some reason powerracks fingers get overloaded quite easily so I will take a bit of a break and see what some of you guys have to say.