Some random things I hate about this game I've played over 100 hours of. They are in no order of importance but I do think they are all things that could and should be fixed:
1. Can't skip cutscenes. You may play some of these missions 20+ times over and you can't skip them? Good thing most are quite short.
2. Load times already suck and there's no option to just start up in the Tower.
3. Unnecessary button presses for tasks like summoning vehicle, using ammo packs and so on when you have a single button press to sit down. Unbelievable.
4. Not nearly enough variety in the bounties. Many boil down to "play this story mission...yet again".
5. There are a stupid amount of currencies that are never really explained at all. Glimmer, Marks, Mote of Lite, Strange Coin...it's silly.
6. Limits. Limit to 25k glimmer (is that the only limited item?) that is never told to you even when you reach that limit. Limited storage in vault. Limit of 100 Marks in a week.
7. Useless and unnecessary items that increase your glimmer count for a limited time. They would be useful if you ever needed to use them, but you simply don't. They just overcomplicate things and I guess make some people feel like "ooh I got a reward"! Except they're a terrible reward.
8. Only being able to equip a single exotic wep/armor. Another arbitrary limit which also works to shorten enjoyment of the game.
9. Cool down period after sprinting is pointless and only makes your character feel sluggish and unresponsive.
10 . Not enough exotics and legendaries. I've gotten differently named Legendaries yet they have the exact same appearance. That's pathetic. It's also ridiculous that you get Legendaries for other classes that you can't even use on your character.
11. Not enough encouragement for doing things. Hey I just spent an hour doing this basically by myself. And I get...nothing for it. Fantastic. Why are there even level 28 story missions when you get NOTHING extra or different from doing them? There are probably much better examples but the point is the rewards can absolutely suck thanks to RNG, or simply no rewards being given for things.
12. Terrible shaders. Make more. Maybe let me buy some for a high price and give me a reason to use some glimmer or those "useless" items I talked about.
So there are some things that immediately come to mind and that I think are absolutely fixable.
Edit: Destiny IOT10I Things I Hate About You