The RotS novelization has 3 big problems.

The writing style is TOO melodramatic
Stover trying to force his Shatterpoint fanfiction into pivotal scenes
The pacing is really unbalanced. He speeds through the Mustafar sequence like the deadline to turn in the manuscript was the next day.

Bonus problem- His characterization of Dooku was questionable compared to better EU entries such as Yoda: Dark Rendezvous.

But Regarding AotC, I don’t think it was changed more, I think the changes are just more obvious. The fake beard and all that.