MMR, or Match Making Rating, is an individual value assigned to each player. For Honor uses this value as a matchmaking parameter to match you with players of similar skill when you play PVP game modes. Consequently, the MMR evolves with each match you play.

Do normal games use MMR?

Fun fact, normal games have a Hidden MMR system so you can still get placed with similar skill people if you play it enough.

Why are LP gains so low?

League players are gaining low LP due to “internal changes to ranked system” in preparation for new season, Riot says. The LP gains should normalize after playing a few games. But low LP gains and dramatic LP losses may affect players ranks in the future. Season 11 will likely kick off in January 2021.