This is very similar to request 953116, which was closed several years ago as "should be fixed soon", but doesn't seem to be.
Essentially, I'd like to see the x highest-rated comments for a story, instead of always seeing all comments rated y or higher. I'd suggest two settings, a minimum number of comments and a preferred number of comments. The minimum would be a hard value, and could drop the rating to -1 if there weren't enough comments at higher levels, while the preferred would be a softer value.
Example:
-1: 500 comments
0: 150
1: 100
2: 60
3: 45
4: 25
5: 10
Preferred Minimum Min rating (comments) shown
15 12 4 (25)
15 10 5 (10)
20 10 4 (25)
And so on. It would allow me to get a feel for the discussion about an article without having to change my minimum rating every time I switch from an older article to a newer one, or vice versa.