Well, 80% is not too hard an average to keep up - IF anything less than 5-star is an insult. It kind of makes everything else meaningless and puts a big pressure on everyone to be hysterically enthusiastic about each other. But maybe it makes us all behave that much better, too.
I wonder - if I give a guest 5 stars in 3 areas and 4 in another - that is still basically a 5-star review, right? (I know, I probably have the wrong number of categories.)
I do think we should leave room for honesty - and if guests aren't reading the house rules, then they should be. My 1-star review is proof of that.
If we can go to the trouble to publish our listings just-so and then make the place just-so - then guests can go to the trouble to read our listings before they book. Especially when Airbnb is not willing to review - um, reviews - for fairness.
I also think four stars for a considerate guest who just naturally stayed within rules isn't harsh. This I think we need to be more realistic about. Otherwise we should have two stars - 1 for Terrible, 2 for Awesome.
Just trying to keep things in perspective!