The one that I've had the most fun with recently would have to be ESO (Elder Scrolls Online). It's a little bit of a grind fest without Premium, but it is fun, especially if you have a few friends to play it with. If you like Skyrim and other Elder Scrolls games, then you'll definitely like ESO. Especially now that the monthly subscription has gone.
"It never hurts to keep looking for sunshine" - A. A. Milne