There's the overuse of RNG, the missions mostly ending with Horde Mode, the multiplayer is in barebones and needs serious balance fixes, the fact that there is all that backstory for Destiny but it's not even in the game, the dialogue is awful, and you don't have any reason to care about what's going on, they just tell you that you're back from the dead, you don't get an explanation about anything and you just shoot aliens with no background on who they are or what's going on. The game doesn't even change too much after level 20, it's just more grinding. The gameplay, art design and music is about all there that's good about the game.