Detail: This is a decent tutorial. However, this is also a very simple tutorial. You are kind of vague in some places. I know that you will see the weak point picture in game, but it may have been helpful to tell me where to shoot the Hanged man since the images posted here are too small to see. The video covers that issue so that is OK. (Minor detail, but do you mean Hanged Man's weakNESS?)
Readability: This tutorial is straight to the point, and tells you just what you need to know (his moves, what you need to do) and nothing else, which is good. The HP bar is kind of helpful so I know when he will stop using his bats, not particularly necessary however.
Usefulness: Pretty useful for those people who can't beat the Hanged Man, I beat him on the first attempt using this tutorial. If for some reason someone doesn't understand the text (which is perfectly readable) the video goes over the whole thing visually. Great tutorial, I wish all tutorials were like this; straight to the point with good visual aids.

It's a good tutorial, but not so usefull...

Hated that guy more than any of the others, and I'm a huge arachnophobe so that's saying something.

At least HotD 1 and 2 were kind enough to pretty much show you a big sign saying "SHOOT IT HERE DAMMIT"