Sorry if I sounded a little harsh to folks before, I had to leave for something but wanted to get a message of warning in in case you were out buying it.
So ... is the setting great, or is it not?
The setting itself is
fantastic. It is just the 2nd edition version (as in, rules) were written much more clearly. And you can get all the text for the setting for free on the internet, or better yet get the MotRD boxed set off of ebay, rather than paying $50 for the flawed book.
Character classes: I don't have the book anymore as I said, but I remember being particularly dissapointed with the classes. Basically there's like 5 main 'classes' (soldier, scholar, etc), and each one has three subclasses you have to choose from. So soldier has 'athlete,' explorer, etc. And they aren't like professions or templates, they are full-on classes. Meaning more pointless bookkeeping and obscure rules differences that could've been handled by feats or class choices as you level (like the 3.5 ranger). In most cases the differences are described all together in one big paragraph which you have to hunt through to find your rules.
The art is also nothing to scream about. A lot of it is cartoony like d20 modern (which I dislike) but in black and white. Again this is where the boxed set shines, the art is more charcoal-ish and dark.
The boxed set also comes with some sweet maps and stuff that the book lacks. I really mourned after reading that book as the d20 rules presented therein are very poorly put together. And if you are considering dropping $50 at a game store you don't even really like, I want to strongly discourage that. Get the boxed set used or download all the setting description and use the cthulhu d20 rules for your mechanics or something.
Maybe after reading the setting and thinking about what kind of character classes are available you can make your own classes, or steal them from somewhere else. I would love to read anything you come up with. When I played my PCs through some Gothic Earth I just used Cthulhu d20 rules and gave them free quirks I made up based on their chosen 'class' (priest, investigator, ect.)