>I'm up on calculus and linear algebra, but I only took one statistics course as an undergrad 25 years ago.
it is a serious graduate math stats book but i personally don't consider it a graduate math book (because it does not use measure theory). it is proof focused because it's used for foundational grad stats classes (i.e. prep for quals) but the proofs aren't that hard to follow (if you've had a good calculus class [epsilon-delta definition of limits]).
some of the exercises are brutal algebraically though. good things there's a solutions manual floating around :)
This is definitely true, and I wouldn't recommend this book to anyone unless they considered this a feature. For me, it was/is a feature, because I suck at algebra, and this is helpful.