Although this recent Halo title's multiplayer goes back to its old roots of classic fps of its predecessors and proves the formula to still be fun, there are some flaws that hold it back from being an overall enjoyable experience.
The first problem I'll mention, that many other players who played multiplayer criticized, is the progression system. While you don't level up or gain XP based on your gameplay achievements and skills for each match, you do level up based on the challenges you complete. These challenges, whether they're daily or check-list challenges, tasked the player to perform in order to level up, unfortunately. This does break the flow of progression, and it leads the progression system to not be as enjoyable as the Halo titles of the past's multiplayers such as Halo 3, ODST, and Reach (even Halo 4 and 5) for better or worse. However, this is not a problem for players who don't care for level progression, even some or most of the pointless cosmetics, and can still find the multiplayer enjoyable without the need to unlock (or even purchase) anything. Still, this XP progression level system leaves a lot to be fixed and is not as well programmed or thought out as the previous titles' mutliplayer progression system (with the exception of Halo 1 and 2 which didn't need any).
While the gameplay of the multiplayer is fun and can give many players a good time, there are many flaws to not only some of the equipment used, but also some of the weapons as well. I found some of the weapons to be less effective in terms of damage, such as the disruptor, ravager, and heatwave, and rather pointless to use. This includes one of the equipments you use like the threat radar that is pretty pointless to use.
I'm also disappointed that this multiplayer lacked tje option to choose singular multiplayer types for players to join like its previous titles, such as slayer or capture the flag, but instead only had them mashed into these game type playlists, where players are subjected to play multiple game types that they aren't a fan of such as Oddball.
Overall, I wouldn't recommend playing the multiplayer. It can be fun for a while, but there's other multiplayer games that can be a lot more engaging and fun than this one (Verdun, for example). Not only is the progression system not worth the time, even the money, to suffer through, but also the gameplay, despite the "new" weapons and equipment added, including the grappling hook, can get stale after playing for a while. However, if you don't care for the progression system, I would recommend the multiplayer despite its flaws.