Okay so this is going to be rather lengthy. WARNING IF YOU CANNOT ACCEPT OTHER PEOPLE’S OPINIONS ON THIS GAME PLEASE LEAVE THIS PAGE! THE BACK BUTTON IS THERE FOR A REASON! And now with the disclaimer out of the way:
Okay so while I do like opening req packs to get armor, that’s ALL I care about, there should be armor packs and warzone packs, where armor gives you nothing but cosmetics for your spartan, war zone will only give you stuff for warzone (duh). Because I’m sooo tired of getting 2 certifications out of a gold pack, I just want the decimator helmet 
Then there’s the sub-par player vs player arena style. Now I say sub-par not because the gameplay sucks, but because the majority of the maps suck making the gameplay mechanics extremely broken such as sprint and thrusters. Think about it if we actually had an ARENA map the size of Reach’s Forge World, sprinting and thrusters would work really well together, or even on their own, but they don’t because the maps are waaayyy too small and the spawns are trash.
Now for Warzone, it’s a cool idea, truly it is, but it needs something to keep it fresh, maybe randomize the boss spawn locations so it changes around every game making it unpredictablem, or making it so you can call in a small squad of marines using a req station to either take a base or destroy the enemy core. As for Warzone Assault, I don’t really think it’s needed at all, it’s basically just BTB mixed with Territories and KoTH, it’s stale.
Speaking of Stale did somebody say Forge? Seriously for years people complain that all the forge maps look the same, and then 343i completely overhauls and rebuilds forge from ground 0 and the final product is rather disappointing, not in the features, but rather the block pallete itself. No buildings, no “decorative” blocks, I mean sure bodies are nice but structures, dependig on how and where they are place actually make some different maps. I know Tom French said that we’d be getting a prefab sharing system soon for H5 but honestly I just want the classic structures added back to Forge, a LOT of people including myself not only want. but need them back!
Custom Games where to begin with this? Not really much to say really other than the fact that 343 are still lacking in MANY gamemodes to be added to customs to say the least, such as Race, KoTH, Regicide, and Riccochet. Why do we not have these? Please just tell me why. I don’t much care for Race or KoTH, but Regicide and Riccochet were my most played games in MM on H4 and I would LOVE to see them come back in Halo 5.
Spartan Abilities, these are armor abilities reskinned folks, much like the majority of Halo 5’s “DLC Content” at least that’s what it seems. Thrusters, again due to small maps, are just as OP in H5 as Armor Lock was in Reach, while I DO like Sprint and Clamber, Ground Pound, Spartan Charge, and Thrusters seem like an unneeded distraction from how small the maps really are.
Firefight, A LOT of stuff is wrong with this game mode, Warzone Firefight was initially intended to be a game type for “casual” players, y’know sit back relax head shot a grunt, stick an Elite in the crotch and -Yoink!- the dead AI you left in your wake of destruction, and y’know what it’s not even that bad, the Covenant are a total JOY to fight, even the Grunt Goblin considering you can one-shot it with a sniper if you angle it right. It’s the Promethians, the basic knights should be killable the way they were in Halo 4’s campaign and the boss knights should be killable like Halo 5’s campaign knights, that way players can stand a chance when rushed by knights, beat downs for all! The Soldiers just need a nerf on how much they teleport, other than that they’re ok. The Warden needs to be removed, at least the mythic one does, it’s WAY too bullet spongey. At least make the Mantis stomp do some significant damage to him at point blank. All in all I’d say Halo 5 could’ve turned out much worse, but I’d still say Halo 4 is a better “Halo” game than 5.
and then either remove the respawn timer increase, or remove req level recharging and allow us to call in reqs as soon as we spawn, here’s an example: I hit Req level 6 on round 5, call in an Answer SAW die immediately, my SAW despawns, BUT I don’t have to wait the entire round to call in a better Req, just go to a Req station when I spawn and unleash Hells fiery wrath.