Fantasy series with a very D&D-esque world and a combat system that feels a bit like an MMO or a turnbased tactics game. It's real time with optional pausing, and you operate your whole party at once, with the ability to pause to give each of them precise orders, or to pre-program them with specific responses to situation.
I think it mainly became popular on the back of its characters. The story was good but nothing special, and personally I found the combat in Origins to be absolutely terrible. But building up your party, getting to know the characters and making decisions that affect them was amazing. At least on par in this respect with the original Mass Effect trilogy.