An issue with the scoring system for GHB is that the loser loses 50 points. This leads to a lot of "back and forth" points and some mains being hardstuck at <1,200 points.
I performed a 29 day long simulation with a starting population of 1,600 active players to see where the majority of players would land. This was done with a lot of assumptions made in order to simplify the simulation but it still highlighted the issue of how flawed the scoring system is for GHB. Link to the spreadsheet with the simulation:

https://docs.google.com/spreadsheets/d/13mtvcNYQj2FTmZdv46SePuuP1cRoIfOT1fuYGToOMIQ/edit?usp=sharing

After 29 days, a whopping 65.5% of the player base will never get out of the first grade type (Warrior 1* to 3*, 1000-1200 pts) which gives 1,500 to 2,000 GP. The other 31% will remain in the Knight ranks and less than 50 people will get to Hero or above ranks. It also takes 27 days of wins WITH NO LOSSES to hit the highest rank of Legend 3*. This is absolutely ridiculous.

I also frequently see players with low damage/alts top the ranks. IMO they should change it so players who lose don't lose any points or change it so it's more like Guild battles were you lose points depending on how large the difference in damage dealt to the boss is.
E.g. Bar gets pushed to 50%-60% - 0 points lost, 61-70% - 10 points lost, 71-80% - 20 points lost etc.