I love the world, the designers have made some of the most amazing spaces to do battle in. I love the lore and the way the community has grown up around it. I love playing this game with friends...
i like how "opt-in" all of it is. Granted, too many of the things to do outside raid content are "go to the place and shoot the things", maybe with the flourish of "collect things off of the the things you shoot", but the mobs, even at their weakest, are still fun to kill.
Few things are as satisfying to me than a well-aimed Shield Throw ricocheting off of a dozen dudes, vaporizing them into purple sparkles.
Seriously, the story is a lot better. The lore is finally fleshing out more and connecting the dots left behind from Destiny 1. They leave a lot of hints and clues as to what is going to come. How are the travelers ghosts connected with the vex? How are exos connected to the warmind? What's going on at the reef? Hopefully these will be addressed soon.