I think it's a good start this rating system ... honestly , i miss another rate_button ... the *fair* one, when the average price setup by members for a mining boost = 40 sats and someone put them in for 45 or 50 .. i still should say *fair* instead of *good*.
I couldn't agree more, the system is good and useful and a "fair" button would be great.
Yes, a 'fair' button might be a good idea or add a new button for 'great' deals. Although such offers do not last long in the market.

However, I still think it would be good to introduce some incentives for good reviews and penalties for bad ones.