[Edit for addional point I forgot to make about optional characters, and general derp-ness]
Yes, I know, that probably sounds like the title of a Cracked article, and I apologize.
Having gotten that out of the way, I think now would be a good time to point out my policy on spoilers. It’s much the same for games as it is for movies: If it’s a popular game, and it has been out for at least 10 years, then chances are, due to TEH INTARWEBZ, everyone has probably heard any large-scale spoilers anyway, so I don’t feel so bad about including them. Anything more recent than that, I’ll /allude/ to spoilerific events in a way that anyone who has played the game will know exactly what I am talking about, and anyone who has not will know that, for example, there is a plot twist somewhere in the game, but not what exactly it is.