Should be 5, but i agree the 10 point scale isn't very good.

Heck, you could even go with a 3 star system for "incompetent, fair and good).

You and others seem to define intervals excluding endpoints:

https://en.wikipedia.org/wiki/Interval_(mathematics)#Including_or_excluding_endpoints

That would make sense, if we would use every possible number in this interval. For instance if a game would be reviewed with the score 6.74835445372. But that is not the case. In reality a finite number of possible score is handed out, making it an integer interval. And I cite:

"An integer interval that has a finite lower or upper endpoint always includes that endpoint."

That makes sense for integer intervals or intervals, because if you exclude on an 1-10 interval the one and ten, you just end up with an 2-9 interval. It's exactly the same. If you call a 2-9 interval an 1-10 interval but exclude the endpoints, you end up just confusing everyone.

But OK now, I understand that you talk about a 2-9 interval, just call it differently. Fine, whatever. I substitute in my head what you say and then I can agree. On a 2-9 the score 10 will never be dished out. That is acceptable.

I'm not talking about not handing out 10s as a hard rule, but rather as something in practise as games will always have issues.

5, because it's right in the middle. I don't think average is very good term, because it seems to imply a mathematical average (i.e. we added up all the game scores, and 6/10 is the average of games released this year).

I think a better description for 5 is mediocre.

It should be a 5/6 imo but really anything below an 8 on Meta is usually not that good.

It would give a better perception of what a good game is and what a masterpiece is. Problem is many games like CoD and FIFA get an 85+ without really innovating or adding anything. This is problematic as it puts those games in the same level of games that innovate or are creative (with faults).

I'm fine with the 7 points being the average. I am used to it and it makes sense.

Wait, what?

Are you saying that Indie games shouldn't be able to score higher than AAA games?

No.  I didn't say anything like that. 

Personally, an average score falls around a 6/10. Lower than that and I start to have concerns for the game. I don't think I would outright deny a game lower than a 6, but I'd do some research on the game before ultimately making a decision on whether to buy it or not... Although I do that with new games already. Nothing's change in that regard then, haha.