Its follow-up releases for 1998's Starcraft and 2000's Diablo II were so effective and so good that many, many people are still playing both of those games today, all these years later. Blizzard Entertainment knows the drill when it comes to delivering these sorts of products. After all, truly great expansion packs don't just add new content-they add real depth, and fundamentally make the core game better. The sign of a truly great expansion pack is when, having played it, you realize you could never go back to the original game.
