They had a playlist for everything. No player had any special ability over another , but if Microsoft was smart, they would do what bungie is doing. You have where your power matters, and where you weapons powers have no effect.
Halo went downhill during reach, they tossed the Battle Rifle, which is the go to weapon, and used a DMR. They also added jet packs, temporary invincibility, or invisibility, and just sprint , (dodge too, but eventually took that out with exception of a few game types)
Halo4 - now microsoft, was not bad. BR was back, but again, giving shields, and on field tacticals.
Halo 5 - BR is there but pistol is now the meta, and you can have somebody dead, but if they have dash powered up good luck killing him cause you opposition will be gone.
Halo Infinite. I cant comment much. who knows what they will do, but the assault rifle is overpowered now. My battle riffle can lose to an assault riffle from a large distance. The game is fast, but the frame rate seems to suffer, and be slow. The radar isnt working as i see somebody and hes not there, so I just kill the player real quick and he had no advantage.
They key is to learn off of each mistake, and good choice, and merge.