In reply to deacondeacon:
Certainly if you are a serial logbook trawler, the comments are often revealing and you soon learn which posters are worthwhile and accurate contributors.
I think there is more of an issue with newly developed or less popular routes where there are few votes or comments and as Brian says first ascentionists may have vested interests (or false modesty).
A few examples of this that I've climbed recently that come straight to mind:
At North Quarry in Somerset
Gillyweeedz (4b) forgettable meander, not worth a star.
Chew on This (4b) ditto.
Long in the Tooth (5a) better, but 2 stars is over egging it.
The climbs there are a good resource and have been well bolted, they perhaps deserve more traffic, but that won't make them any more star worthy.
At the Cuttings (Portland)
For Michèle (6a) no stars? Think the first ascentionist here (Mick Ward) has adopted the "I'll see how others rate it, rather than award stars myself approach", understandable, but possibly further muddies the waters of accuracy when it comes to stars. Early comments and votes on this route indicate it is likely to gain recognition as a 3 star classic, quite probably the best route of its grade on the East side of the isle.