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Destiny is an online-only FPS with RPG and MMO elements. You play as a guardian, trying to save the human race from aliens.
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Pros
Pro Improving your character is addicting
One of the main aspects online titles like Destiny 2 is character progression, which is done through leveling and collecting new equipment. Your character gets stronger and when you revisit missions/bosses that gave you trouble before, you can beat them with ease, which feels incredibly satisfying. This will push you to play just a bit more, collect a few more guns and armor pieces, defeat a couple more bosses, and before you know it, many hours will have passed.
Pro Massive environments that feel alive
The open-world environments in games usually have a lot of empty space, so you spend most of the time traveling without doing much else. Destiny 2 has large areas filled with enemies, world events, and activity in general, eliminating most of the downtime. Because of this it feels like you're actually visiting a planet inhabited/occupied by aliens, which considerably adds to the immersion.