I agree with Lethal Weapon about averages doesn't say anything.
The final average is questionable and a bit dodgy from a mathematical point of view.
It's only purpose is to assign the game to "No CRPG", "CRPG ultra light", "CRPG light", "CRPG" or "CRPG Heavy".
The final vector of the categories (STORY, CHARACTER, NPC-INTERACTION, GAMEWORLD, MANIPULATION, COMBAT) is much more meaningful.
To the numbers:
We could have used A, B,C,D,E instead of 1,2,3,4,5 for the scoring system, but numbers have the advantage that you can use post decimal positions. So you are able to express in between values.
Open free world, open story, fully customizeable character is "best".
The group of people that developed the CRPG-Meter system favored games like Wizardry 8, Might & Magic 6, Albion, Realms of Arkania and Ultima 7, Gothic 1, Planescape Torment and of course pen & paper rpgs.
I am with Prime Junta when I claim:
Games with a good story
and an open world design
and a fully customizable character can be made and have been made. Good example: Avernum(=Exile) 1, 2 und 3.
In a good designed open gameworld borders are set with
a) strength of enemies (you have to slay this big bad guy 0815 to advance)
b) quests/story (this door is not open until event xyz has happened)
c) quests/items (this door is not open until you have required key abc)
d) skills of your character must be high enough (this door opens with a thieving skill of 333)
... so everything fits together - just my opion.