Blizzard stands by the quality of our products and our services. Normally we set limits for refund availability on a game, based on time since purchase and whether it has been used. However we want to give players the option of a refund if they feel that Warcraft III: Reforged does not provide the experience they wanted. So, we’ve decided to allow refunds upon request for the time being. You may request a refund here on our Support Site.
I haven't tried to play Reforged yet, but I was tempted to go back to the well just because I liked WCIII so much. I don't play RTS' online so a lot of the stuff that they clipped out of Reforged wouldn't matter super much to me, but the word of mouth turned me off of giving it a whirl. Sounds like Blizzard might just be writing it off, but it's at least nice of them to offer refunds for people who thought it didn't live up to the expectations.