Didn't really need a book to tell you that, but I think a lot of people took the whole "killing his master in his sleep" out of context and so the book cleared that up but ya Palpatine was far more powerful and smart which really is evident by(without reading the book).
1. He found out where his master slept, so already Plagueis failed at hiding and keeping secrets.
2. He couldn't sense his apprentice's intentions, which force sense is a very basic force ability if he couldn't even do that he deserved to die.
But I suppose you are right, I just thought it still was kinda iffy Palpatine just "killed him in his sleep", out of context it sounded very weak.