As someone who has been playing Halo on Live since 2004, Halo 5 is a great multiplayer Halo game.
It has flaws and feature gaps, but is on the whole the most enjoyable Halo multiplayer experience since Halo 3, and that's with nostalgia goggles firmly on.
As spot on as you can get.
No dev made BtB maps, no doubles, no KOTH, Oddball, REQ issues, armor customization issues, no challenges, etc
BUT
What is there is fantastic and its just SO much fun to play and feels so fucking good.
Building on 5 for Halo 6 and adding a truckload of mode, content, and aesthetic and system revisions and it could be the best Halo yet.