The thing is that FPS's, RPG's, "games", "anime", "manga" are not to be used as blanket terms. That's the biggest thing that irks me. The only thing that makes anime anime is art style and, possibly, locale. If it was drawn by different people, in a different place, it wouldn't be anime. Some people don't like the art style itself, which is a different issue altogether, but people make the mistake of defining the entirety of non-western animation by its appearance. That's like saying all cartoons are the same, hence if you dislike one cartoon, everything that looks similar to it must be equally bad.
Also, you HAVE to watch School Days to the end, dude. You just have to. Trust me. You have to.