Show-Stannis is a complete butchery of book-Stannis. Book-Stannis is just and merciful. He specificly forbade burnings, during his march to Winterfell, and told Justin Massey that if he should die, they must continue fighting to put Shireen on the throne.
Last night's episode was the final straw for me. This season has just been so shitty. I'm just not watching anymore. I don't mind people spoiling stuff for me before the books come out. I already knew about Aegon and Stoneheart ahead of time anyway. I'm okay with being book-only.