Warzone is admittedly a very fun, exciting and tense gametype. However, I find that it has one easily noticable, and moderately gamechanging flaw.
Warzone focuses on capturing bases, killing enemy spartans, killing bosses, and killing AI. It also has a very unique weapon system. The REQ system. Player kills, AI kills, boss kills, base captures and assists all count towards increasing your REQ level, starting off with one, and going up to nine.
However, the fastest way to increase your REQ level is simply by killing other players. And this creates a problem. Skilled players will be able to quickly level, whilst unskilled players will level very slowly. At first, the advantage may be small, however the snowball effect quickly comes into play. Before you know it, unskikked players are on REQ level 4, and skilled players are REQ level 6. The skilled players now have access to high powered weapons, and the lower skilled players have moderate weapons. This may seem fair, but it can easily make people stop playing Halo. No one likes being destroyed.
This system also discourages boss kills, and playing the objective. There is a solution to this problem.
Right now, your REQ level is tied to your kills (and everything else). By tying it to the length of the match, you ensure that everyone can get a BR at the same time, everyone can get Sniper Rifles and Rocket launchers at the same time, so on and so forth.
This will still allow skilled players to dominate the other team, it will, however, make more people go to bosses, and will leave room for more tactical thinking, as instead of calling in a tank or wraith at REQ level 5, you might call in a plasma pistol to take out the enemy vehicles.
This will inevitably create a fairer playing field. This video sums it up well.