First the book is clearly not the 'detailed look at the internal architecture of the groundbreaking new C# language' that it claims to be.
Despite this claim, the book also claims to be accessible to anyone with experience in one of the 'C' family of languages (including non OO programmers). The book embarks on a poorly put together lightning exploration of OO, which will be irrelevant to anyone with any OO experience at all and incomprehensible to anyone else.
The rest of the book is a fairly standard step by step examination of C# language features with a brief foray into MSIL (hence, presumably, the justification for 'In Depth').
The description of language features is an adequate reference, but the author's attempts at describing good program style are probably best avoided.
I am hoping there will be a good C# book soon...