Protip 1: change your button layout to "Recon". It'll minimize the changes from H3 to Reach. Otherwise, it feels totally different.

Notes:
- The DMR is a long distance pistol. I miss the BR spread, but this is truly a hybrid between a pistol-sniper.
- The grenade launcher (not the sticky cannon) is absolutely useless.
- The loadouts (armor abilities) are great. Running makes so much sense and it really saves your ass in ways you're not used to. Die, dash to get your weapons back. 1 shot, dash to a health pack for a refill.
- When you enter matchmaking, you're ... well, in it. Finish a game, check out your stats ... in the background, you're finding new opponents.