I'll cut to the chase since I've already talked about Stephen King several times. The last hundred pages of On Writing weren't too bad. Most of his misfallings I pointed out already, ranging from disregard for the growth of writing abilities and slamming TV. The only other thing Mr. King did to tick me off in his On Writing section was to diss Robert Jordan. I suppose it's a taste thing, but it was still very off-putting.
From start to finish, the words themselves were masterful, even if the content wasn't 100% glam. The memoir section is still my favorite, although I never caught why it was called C.V. His life experiences definitely made it easy to see why he ended up a horror writer.
Mr. King's writing methods are odd. Exclusively discovery written with situations in mind, it's crazy that he generally only has two or three drafts. I'm not a particular fan of his "I live in Maine. Therefore, most of my books will take place in Maine." approach. Furthermore, he implanted himself into some of his books, most chiefly The Shining. It's about an alcoholic author for (insert choice deity here)'s sake. Edgar Allan Poe displayed the same habits.
On Writing gets an 8/10 in my book. It was a nice, quick read, yet some of the ideas presented in it are despicable. It would have gotten about a 19/20 if it weren't for about ten pages. Was it worth my time? Yeah. Could it have been better? Maybe, although the parts I didn't like were generally subjective anyway. And the biggest question of all: Should you read it? Put it midway on your list.