Server issues and connection problems plaguing Diablo 3 has prompted Blizzard to offer a refund to players in South Korea after much prodding from a Korean consumer protection agency.
On the official South Korean Diablo 3 website it was announced that unsatisfied players under level 40 can start applying for refunds on June 25. Furthermore, if anyone has purchased within 14 days and is level 20 or lower, they can return the game for a full refund.
South Korean consumer law states that consumers are due a refund if they purchase a product that doesn’t work through no fault of their own, and it's certainly well documented just how many issues Blizzard has had with the massively popular game.
Blizzard is doing this to comply with South Korean law, but don't expect this treatment in other countries. Most game publishers anticipate minor issues at time launch and hope for a "forgive and forget" treatment from players. Perhaps this will be the wake up call to make sure games are suitable for launch.