I have a few problems with Destiny:
The storyline is crap.
It had great potential; but you didn't do anything with what you had. You just left it there and did nothing with it.
The PvP balance was frustrating.
It was "nerf this"and "nerf that" (Thorn and TLW needed it though) it was almost never "This gun feels just right. Not to OP, not to UP." Everything was changing for the worse, and barely for the better.
What I did/do like about Destiny are things that just felt super cool.
Like when you first see your ghost when he revives you. Or Dinkelbot saying "We've woken the Hive!" Imo Dinkelbot was so much better than Nolandbot. (sorry I don't know how to spell his name 😅)
The sniper battles were also *so* much fun. At least when we both missed then one hit. Same thing when it was shotguns.
The things I liked was pretty much everything when I first started. But then it got so repetitive that it was boring.
So my advice for D2 is to make a storyline that players want to play over and over again.
Go off of the Queen's brother first maybe, or really anything.
Then make DLCs that go on to other things in the Destiny universe. There are a LOT of things that I want to fight/team up with. I.e. The Ahahamkara, Osiris and teaming with the Stranger.
Destiny is a great game. But it wasn't as good as I thought it was going to be.
I hope D2 will be just as good as D1, just with a better storyline and DLCs that are somehow are "hinted" and connected to the the storyline or previous DLC in some form.
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Hand cannons should be a secondary with side arms, maybe leave one exotic in the primary same as vex and nlb.