As a Novak fan, I strongly disagree.
Novak is very good from forhand side, as every single great player. But! He is not in top tier forehands, at all.
His game is great beacause of his instincts and split second decisions. He puts the ball in worst places for his opponents. Precision wise, angles wise, you might debate he has one of the best fh ever, if not even the best. But fh is so much about pace/power.
Imagine what kind of beast he would be, if he had Del Potro's fh. No need for precision in mm, when no one can catch the ball in the first place.
There are many elements to groundstroke, such as power, technique, variety, precision etc. Novak fares great in almost all aspects. He has decent power, as well. But that still doesn't compansate for immense power of few other guys.
His overall game iq, technique and physicality more than compensate, and he can endure fh 2 fh with best punchers. He can outsmart them with unexpected and ridiculously deep and accurate placement, crazy angle, but give him power, he would destroy opponents in first two hits, conserving energy for rest of the match.
One thing is to be one of the best from fh side and other to have one of the best fh ever. He is the former, not later.