I put off watching School days basically out of fear. I am a big fan of romance animes and from jokes and what I heard, I knew how it was going to end... and originally, it did piss me off. Makoto is such an asshole and deserved what was coming to him. I was pleased by what happened but he still pissed me off.
But then, after thinking about it. I wondered, what other anime actually has the balls to go against the conventional storyline of romance to deliver such a powerfully horrific ending? After thinking about it, I respected this anime more, yet, at the same time, I decided to buy the visual novel and start playing because I want my endings damn it!...
Bottom line, this didn't really effect my grading of School days. I don't regret watching it at all. It was worth a shot, it's worth the jokes, and worth the time just so you can form your own opinion on the anime because other people's words just don't do it justice.