Agree with all of your points.
I'll add my 2 cents worth to some points:
WEAPONS: Get rid of QSing! It's an utterly ridiculous mechanic and should have been taken out of the game already. Or just get rid of snipers. The maps in COD aren't big enough for them.
I agree about the weapons in BO2. Every time I unlocked a new one I'd think "I like this weapon" but then I'd unlock another and think the same.
MAPS: Go back to simpler map design like in older CODs. This new way of making maps where you have 10 different angles to be shot from no matter where you are makes the game less fun to play.
HIT DETECTION: I don't know what's happened with the past few CODs but something strange has happened. Most of the time you die before you know you're being shot. This happens offline against bots so it's not lag causing the problem. Maybe it's something to do with the game engine? It is VERY old now.
EQUIPMENT, ATTACHMENTS AND PERKS: Perks - I'd like to see the return of pro perks. It was fun trying to unlock them. Make the anti uav perk like in BO2 where you have to move to make it work.
Equipment - please don't have anything like IEDs! And definitely NO Tac Insert.
Attachments - get rid of anything nooby like Tracker Sights or Target Finders ans that includes Thermal Scopes!
KILLSTREAKS: Bring back Score Streaks from BO2.
SPAWNING: Fix the spawn system! It's been broken since MW3 and is still broken. Have dynamic spawning and no fixed spawn points. Split the maps into a grid and allows players to spawn in any square in that grid. Which includes inside buildings. Give players spawn protection against Killstreaks.