Problems in the Halo series, and ways to fix them. This is by no means comprehensive, so if there is an issue I’ve overlooked please include it, and what you consider to be potential solutions. Will these things get fixed? Probably not but hey I felt like doing this anyway 
FFA Boosting- Players go into FFA with guests or a teammate in an effort to gain an unfair advantage.
Solution? Max party of 1 in FFA. You NO LONGER get to bring multiple people into FFA.
Saboteurs- People deliberately sabotaging their team for any number of reasons.
AFK players- giving up 20+ free kills making chances of winning slayer significantly decrease
People getting around betrayal detection, via constantly dropping your shields or other methods
Solution for all of the above? Vote to kick system.
Now this has to be implemented smartly though. In some games troll teams will implement the option to kick themselves immediately at the start of the game, naturally nobody will kick because they haven’t misbehaved yet. Then they get “Kick immunity” and can troll all they want. Other times people spam vote to kick options the entire time. You can fix both of these problems by not having “Kick immunity” and allowing all players the option to vote to kick ONCE per match. Implementing a vote to kick system gets around many major issues, and implemented correctly I believe would be a huge boon to the series.
Randoms matched against inheritor teams quit out a lot and make winning unviable
Solutions? Well first there could be a better effort to match randoms against randoms, and teams against teams. Randoms should be able to enjoy the game just as much as full teams. Additionally, don’t reveal certain info in the pre-game lobby, such as player’s KD, which ones are in a party, emblems, and player’s ranks.
You could also make a playlist similar to MW’s mercenary idea. 4/8 randoms vs 4/8 randoms, no parties allowed, ONLY randoms.
Achievements like All Alone virtually impossible/hugely luck-based without full team boosting/searching.
Solutions?
Achievements released with new maps should be obtainable on ANY map
There needs to be playlists where these can be earned without overly relying on luck
Do what Mass Effect 3 did, multiplayer achievements could also be unlocked by doing something in campaign, so players without internet, or who don’t want to pay for Gold can still get all the achievements
Players who betray teammates for Sniper/Rockets.
Any player who is betrayed within a minute of picking up Sniper/Rockets gets the option to kick the player regardless of that player’s prior betrayal history. Note that this is not an automatic kick, so the betrayed player can still use judgement on whether or not they were deliberately betrayed for power weapons
Players quit out of games and make it harder for their teams to win
Solutions?
Join in progress option to fill the gaps. Now some players do NOT like being thrown into matches at the end, so each player should have a toggle option in which they can join in progress, or they never will join in progress.
Additionally say you’re on BTB 8v8 and 2 people from blue team quit, making it 6v8…now the game HASN’T EVEN STARTED, so freaking rebalance the dang teams and make it 7v7. Shouldn’t be rebalanced after the match has started, but if it happens in the pre-game lobby there is no excuse.
You could automatically add in bots (Several games have bots so it obviously isn’t that hard to do). Now the trick is to keep the game still balanced. Say blue team needs 2 bots. Blue teams average true skill is 1300, so the bots should keep it at 1300 average. That way it isn’t like you’re losing or winning solely due to bots. Also make the bots voice commandable like the AI in Rainbow Six series. The player with the highest skill AND a mic, should be able to issue voice commands to the bots
Spawn traps. Now some people think it should be in, others hate it, but honestly if you’re the better team you’ll be able to win without spawn trapping, and all it does is ruin the enjoyment for the team being spawn trapped.
Solution? I don’t like temporary invincibility as it leads to having players spawn right in front of you and slaughter you because you can’t return fire. I think a better option is being able to choose from 3 or more spawn areas while you’re respawning just as you would with the Dpad in Invasion. Teams can still maintain map control (Power weapons and power ups), while making it harder to set up spawn traps.
Lag due to players in different countries playing.
Solution? North American players play together, Australian players play together, etc. Got a friend in a different country? Play customs, you shouldn’t get to lag the game for EVERYBODY by bringing them into matchmaking. Additionally you could have an international playlist where you could still play with your friend. Note this is coming from a player in the US, I’ll do good regardless, but I recognize that it creates an unlevel playing field for players in different countries. Call me crazy but I can only take enjoyment in winning if it was a level playing field, beating somebody who’s lagging up and can’t fight back isn’t very satisfying.
Certain players like to betray their teammates in order to stop them from getting perfections. (Not a HUGE issue, more of a personal one lol)
Solution? Don’t broadcast to my team that I’m on a killing spree, killing frenzy, running riot, rampage, etc. Doing that with a random on your team puts a huge target sign on your back. Having my team know that I’m on a spree has to date NEVER helped myself or the team, all it has done was hurt me when some troll decides to betray me to ruin my perfection.
Control layouts don’t suit everybody, and can stop crippled gamers from being able to compete to their fullest ability
Solution? FULLY REMAPABLE CONTROLS. Damn near every PC FPS has this, so why are console gamers treated any less? For the record I’m personally fine with Bumper Jumper and I use the Walshy Claw for my armor ability use, but I was ignorant on the issue of crippled gamers and didn’t realize how big of an issue this is to them. When I was in Iraq if I had a choice of losing my feet or hands in an IED attack I would choose my feet every time. As an avid gamer I would dread trying to play without my hands. A minority of gamers live my nightmare, trying to enjoy games on preset loadouts which just don’t allow them to do what they need to get done. Even if you think I’m full of it on every issue, please support re mappable controls so that crippled gamers can enjoy the game as well.