I'm used to reading books on physics where the authors (even the Russians) give a bit of background and (usually made up) history but when I go to read a book on something like Finite Element Analysis (For engineers) it feels like the author is literally just dumping his life's work into LaTeX without any thought beyond A->B.
Don't get me started on pages and pages of MATLAB or Fortran code without any indentation, comments or variable names longer than two characters. (This is why I believe writing algorithms in real programming languages is playing with fire in textbooks).