Graham Bennett writes:
"Some of the best games come in trilogy format: Halo, Diablo, Warcraft (pre "World of"), so wouldn't it make sense for developers to plan on making trilogies? After all, filmmakers and novel writers have been doing so for years. Well, what's good for one medium isn't necessarily good for others, so the short answer: no, game makers shouldn't plan out trilogies. Full reasoning after the jump."