Keeping this short and sweet, I will get to the main points.
Personally, Halo 4 feels like gameplay showcases cheap thrills over actual dedicated fair gameplay.
Why is it that the jetpack can be used as a cheap mechanism and crutch for lack of skill to gain an upper hand in personal 1v1 fights? Watch this for a perfect example demonstrating the cheapness in these situations.
Loadouts are another hole in the soul of Halo 4. They were a fantastic idea but as Josh Holmes stated having to hire people who hate Halo for “X” and want to add “Y” to make it better, they hired too many Call of Duty ex employees because now we have almost the exact same loadout system as CoD has, topped with broken/imbalanced perks “armour mods” and imbalanced starting weapons/grenades.
This video is a perfect example how loadouts have completely destroyed vehicle combat, an no amount of weapon tuning can change that until we have properly balanced loadouts.
When scenarios like this are capable of happening because of what we can choose to spawn with, which fundamentally change what used to work in Halo, it really degrades the game down to almost nothing.
When you add all this together, you get a game which has a poor skill gap, incorporates a cheap lottery personal weapon drop which from the very start is unfair for both the user and enemy. All this reduces the playability of the game to what it is now; this game has less players playing the game than Halo Reach did at the end of it’s gaming cycle.
In short, Halo Reach had more players playing multiplayer after two years than Halo 4 does after 7 months. This is extremely disheartening coming from a dedicated fan of over 10 years.
My only solution I can see is make new and old co-exist. Because right now Halo 4 is nothing like what Halo used to be, but some people like that, which is perfect as long as we have a proper setup, proper playlists which incorporate what Halo was in the past.