Snape was my favorite even before book 6 started dropping anvil-clues that he was really a good guy. About his only actions I would find unacceptable is if he really was unfairly grading his classes or otherwise teaching poorly, but though that's suggested in students' complaints (and by e.g. Harry not getting the top grade on his potions OWL) it's not clearly shown that he was.
His blatant favoritism toward House Slytherin students appeared no worse than other faculty members' blatant favoritism for other Houses.
Around mid-series I hoped he'd finally be the Defense Against the Dark Arts professor in the final year, but the plot went elsewhere. (Too bad -- Snape might have been the only wizard in the history of the wizarding world smart enough to realize that the best and most-often-used defense against curses, especially avada kedavra, is to dodge. His DAtDA classes could have looked like gym classes, with dodge-bludger games every day.) Mostly, I liked Harry but Snape was always spot on about Harry's bad points so liking Harry only made me like Snape more.
In retrospect, I wonder if Snape's dislike for Harry was more due to an instinctive reaction to Harry's hidden 12.5% Voldemort content. Snape knew and hated Voldemort more than anyone; I think that could have counted for more than his childhood beef with Harry's father.
Respectfully,
Myriad
His blatant favoritism toward House Slytherin students appeared no worse than other faculty members' blatant favoritism for other Houses.
Around mid-series I hoped he'd finally be the Defense Against the Dark Arts professor in the final year, but the plot went elsewhere. (Too bad -- Snape might have been the only wizard in the history of the wizarding world smart enough to realize that the best and most-often-used defense against curses, especially avada kedavra, is to dodge. His DAtDA classes could have looked like gym classes, with dodge-bludger games every day.) Mostly, I liked Harry but Snape was always spot on about Harry's bad points so liking Harry only made me like Snape more.
In retrospect, I wonder if Snape's dislike for Harry was more due to an instinctive reaction to Harry's hidden 12.5% Voldemort content. Snape knew and hated Voldemort more than anyone; I think that could have counted for more than his childhood beef with Harry's father.
Respectfully,
Myriad