Why do people like diablo2/WorldOfWacraft/StarCra…

i play diablo 2 expension and i admit i do lke the game and i dont know why, anyway i was looking at the chat and there alot of people on it, not only dablo but world of warcaft and starcraft! but i know that the blizzard games get addicting my fmily play it and are stuck on that computer alot.