You could check out Path of Exile. It's a free-to-play arpg ('action' role-playing game, what this style of game is called). It's super complex and not for everyone. It's fun but doesn't have the polish of a blizzard game. It would give you a feel for the gameplay loop common to these games. It's available on pc, just googled it and looks like you can get it on xbox and playstation as well.