I like the lack of comment scores (to avoid everyone piling on one comment), but I think I would like it more if I knew what went into how high a comment was on the page. Is it a fact that the first displayed comment will be the one with the highest score? I know some different inputs are used, such as the karma of the submitter, how new it is, etc. but I guess we don't know "for sure".

I don't think the solution is to bring back scores, though. A possible "simple" solution could be to color/star a comment above 50/100 points, etc. Comment scores could also be displayed as percentage or on a scale of 0 to 1, 0 to 10, etc. I'd be more likely to read a comment with a score of 95% than one with a score of 20%. This way you at least get an indication of the helpfulness of the comment other than just its position on the page.