Charles works the angles, gets in there and tries to isolate specific parts of muscle groups etc also tweaks exercises to take stress away from knees etc (Dexter) but yeah it's overhyped for sure.....
Pro's use a lot of machines for isolation, remember they don't care about functional strength only how the muscles look. You will find that when dieted down people that have only done compound lifts will have lots of weak points in their physiques, these must be filled by specifically isolating these muscles. Machines are good at this.