Destiny 2 is not a complete overhaul of the original game, but rather an evolution to something much bigger and better than its predecessor. It improves in every way, including the story, varied content and gameplay.
Good story; Fleshed out characters; Lots of added content; Varied activities and events; Gunplay is absolutely sublime
Lootboxes; The odd connection issue; but nothing major; Crucible feels a bit barebones