The Secret World is my favourite MMORPG of all time. It's revolutionary, unique and focused on storytelling, deploying peerless writing, fourth wall-breaking alternate reality puzzles, atmosphere and exploration where other MMOs use trash mobs. It's groundbreaking, slightly broken and absolutely magnificent.
Better yet, you can buy once and play forever, no subscription required, and grab it for only £8.49 on Steam. The Massive Edition is also on sale for £16.49, if you want to try out the (brilliant) issues 5-7.