I disagree that a rating system would not provide some discernment of good/bad/ugly.
Scenario creators love their build like a child, but some babies be ugly. These ugly babies I wanna keep at arm's length.
As time goes on, good developers will be sought out (WBW for one). However, having a pseudo moderated scenario/operation repository would be helpful for people who have to husband their CM playing time.
Plus having your scenario at the top of the heap might be good motivation.
As far as criteria, I would include:
1) quality of immersion: sounds and scenes
2) balance of forces
3) reasonableness of objectives
4) replayability
Whatever. The number of scenarios and operations are growing at an alarming rate-- which is great! Numerous web sites with scenarios is great-- but I want the mother ship culling the best of the best of the best, sir!
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"That's some catch, that Catch-22."