It's a reference book, and - unsurprisingly, given the authors (Amongst them the creator of the language and a former lead developer of the compiler) - authoritative.

The text is interspersed with boxes of comments by the reviewers, offering a personal slant on some of the features. I didn't find them particularly helpful, and didn't like the way it clashed with the rest of the text, but that's purely a matter of taste.

The title invites comparison to Stroustroup's "The C++ Programming Language", but that's not actually a very good comparison. This is purely a reference book, and one purely focused on the language itself. If that is what you are looking for, this is probably the best (and only) book I've seen. If you are looking for .Net framework documentation or a tutorial, look elsewhere.