anything less than 60% of your 1RM won't induce microtrauma to skeletal muscle so that can help when determining what is actually a working set for you. for some different exercises need more warm-up sets than others. I might do 6 sets on the leg press before I actually get up to my heavy working sets, then I might do only 2 heavy sets and drop sets.
it's to hard to tell if a person is overtraining or not just by looking at the number of sets. plus you have to take into account the level of training of the individual. most newbies just do not have the neuromuscular efficiency to overtrain unless they have a poor diet and are low in cals.
I do think the above routine is a bit much for doing it every 3 days. Every 4-5 days "may" be better. SLDL should also be added. IMO, it's a good idea to hit the hammies with close to 70% of the sets used for quads.