Finished the main story, the only minor XP gap I think is around 13 or 14, you have to do a little bit of public events or PVP or adventures to get to 15 for the next story mission. Really enjoyed the main story, great ending although it also sorta felt like the story was getting super good and then suddenly we jump to the ending, but I think tacking on another 10 hours of story would have pissed off a lot of people so I get it.
A lot of minor quality of life improvements like green/blue engrams auto decrypting to items, not having to equip your highest light gear anymore but the decryptor automatically figuring out each items highest light, not having the ghost take up an iLevel anymore, being able to open up the director from anywhere, REALLY huge maps for everything, etc.
The music imo was the best part of the game, there were some really epic music scores for tense moments, sometimes it got a little too "operatic" but it worked well I think. Only weird thing is I found a lot less nooks and crannies with hidden "stuff", like ghosts in D1. I found a few information spots, but not sure where that data goes.
Not sure how much I am really gonna be into the iLevel grind, I'll run strikes and PVP and nightfall a few times to max out my light and gear but probably only run the raid once. Nice thing is the platinum doesn't seem to require anything crazy, you don't even have to run the raid at the highest level but you can do nightfall in prestige (?) mode. I think.
like marvel movies, there was a post credits scene and i have no idea what the fuck was going on there