Taken from IM PLAYIN
"To start, I’ll state some of my previous Blizzard history… I did play World of Warcraft for many years back in the day. However, by always changing my character, I was never the highest level among my peers but I definitely saw more of the classes than most. I was also a huge fan of the Warcraft RTS games which introduced me to the franchise and I still hold them up as probably the best RTS games I have played and are definitely my favorite games in the genre. Why am I telling you this? Well if you were unaware, Hearthstone uses the same lore as that of Warcraft and while having knowledge of the characters is in no way essential, it can help to make the game that little bit more special and memorable, especially if you have played both the RTS and MMO, like me."