Its really hard to have personal opinions on edducational books... i mean, if theyre really aweful and inaccurate because your textbook is from the 60's or something then sure. I guess you can dis/agree on methods or the general principle of something... or maybe if it were poorly organized... but this book wasnt bad, a little dry but i read it purly to imput knowledge into my brain for my job and for the sake of knowledge itself so i wasnt expecting the author to be scintillating or anything.