Halo 5 is a very good game in my opinion, but there are several ways in which it can improve. These improvements will make halo 5 amazing.
Gamemodes: add all the old game modes back as well as some new unique game modes. Comment some cool game modes down in the comments
infection
koth
race
team action sack
team doubles
Team snipers
etc.
Add unique maps that are beautiful and memorable. Have at least 3 more covenant maps, 3 Promethean maps, and 3 more war zone maps.
Change the UI so we can view players in our lobby
add special challenges to be able to get amazing armor sets that symbolize something. Comment down below of challenge ideas.
These as are what I think will make halo amazing. If they can they should also add campaign dlc.
Also new unsc vehicles
falcon hornet etc