1. Customization unlocks
Compared to previous games, the way that things are unlocked in Infinite’s beta doesn’t feel rewarding or fun.
In the beta, you have to do several challenges to increase your Battle Pass a single rank, but when you do, you might get nothing, a Challenge Swap, a color, a pose or maybe an armor piece.
I’ve been playing Infinite and completing its challenges for a while now (almost 28 hours), yet I only have two armor cores (Mark VII and the Yoroi), no helmets or other armor parts, several armor colors, a few visor colors and a few weapon and vehicle customization options.
Challenge Swaps seem like something that should have a daily allowance (maybe 2-3 each day).
When you consider that there isn’t that much on the Battle Pass, it’s really weird to only or mostly gain through progression.
Also, it seems like doing chores for nothing or almost nothing, depending on the tier, since some tiers don’t give anything and quite a few others only give Challenge Swaps.
Armor colors and visor colors needing to be unlocked or only being able to be bought also seems odd, considering that they are mostly just plain colors with no complex designs.
Even the two camo coatings seem to use the same pattern but with different colors.
2. Maps
I’m not sure why exactly, but some of the maps designs seem strange.
Also, while I like Aquarius, all of the maps lack cover in the main areas, and the way they’re designed also makes them feel rather linear.
I know that earlier games had a similar layout for maps, but with the features in Infinite, the pace is faster, and I guess that it might also be making some of the maps seem odd.
3. Things I'd like to see
a. Iron sights
The weapons in Halo are usually unique, and it would be interesting to have an option to aim down sights with them.
b. Character rotation in more menus
Characters don’t seem to be able to be rotated in the Body & AI menu.
c. Third-person perspective
Even if it was only available in custom games, I think that this would be a good feature.
d. Loadouts and infinite ability use
This would be fun, at the very least for custom games.
e. More unique appearances for current weapons
At the moment, several weapons look very similar, and sometimes, it can be sort of difficult to know which one is being used.
f. Weapon name display
This is sort of related to “e.”, as I can’t tell which weapon an enemy used by its icon.
It would be nice to have an option that displays the names of weapons in addition to or instead of the icons.
g. A playlist indicator for challenges, and a challenge focus
It’s quite time-consuming to find a match where you can complete a challenge, and it’s not always obvious which playlist will have the map and mode needed for a challenge.
An indicator that a playlist has the modes, maps, equipment and vehicles that are needed for a challenge would be helpful.
It might also be good to have a way to focus on a challenge to increase the odds of getting the maps and modes needed for it.
h. Playlist and mode variety
Right now, the playlists and modes seem sort of lacking.
Will new ones be added when the game leaves beta?
I’d like to see Team Doubles, Team Snipers, Team SWAT and Grifball return, as well as Infection and Assault.
i. Matchmaking for custom games
Playing with bots is fun, but that probably wouldn’t work well with certain custom games, like ones where you’re supposed to drive vehicles.
It would be nice to be able to have others be able to look through a list of people’s custom games and join if they want.
j. Less costly customization
Having inexpensive bundles with multiple armors would be great.
Right now, they’re quite expensive.
A single armor set can cost $20. 
That’s a third of the price for an entire game…
Also, assuming there will be 8 seasons at the least, that’s $80, and it wouldn’t include every customization option, right?
I wouldn’t mind spending $60-$80 to get all of the armors, emblems, designs, etc., but right now, the price seems to go far, far beyond that.
k. Match start and end customization
A choice of poses to cycle through for the start and end of matches, and an auto-message system after matches would be helpful.
It would be nice to be able to customize those poses instead of having the same poses cycle, as it would add some personality to characters.
For messages, I’ve seen people write “gg” after winning matches, and I usually try to do the same, but it’s sort of tedious.
Could a system be added to send specific messages and play specific poses depending on whether the match was won/lost/tied?
l. Better bots
Having bots in custom games and other modes is great.
However, the bots seem to get stuck in some areas.
m. Medal experience
Having medals also give experience would be a good addition, I think.
n. Crossovers
It might be nice to see some armors and other things inspired by the games Bethesda, Arkane, Obsidian, id and others made (since they’re owned by Microsoft, though other crossovers might also be good).
Maybe those who have bought/will buy the games could unlock them as a bonus.
My wish list would be:
Fallout
T-45 power armor
T-51 power armor
T-60 power armor
X-01/Advanced/Remnant power armor
Raider power armor
Liberty Prime-like armor
The Elder Scrolls
Skyrim:
The Last Dragonborn’s armor
Daedric armor
Nightingale armor
Dragon priest masks
Dawnguard heavy armor
Nordic Carved armor
Miraak’s mask
Oblivion:
Legion armor
Crusader armor
Madness armor
Morrowind:
Bonemold armors
Ordinator armor
Misc.
The Outer Worlds:
ADA AI
Dishonored:
Corvo’s mask
Prey:
Morgan’s helmet
DOOM:
Doom Slayer’s armor
Tyranny:
Helmets from the Scarlet Chorus and the Disfavored
Minecraft:
Emblems and charms with characters and items
I’m looking forward to seeing how the game will change, as well as the Forge and Firefight modes.