It's unfair that someone has been rating walls way down
Just took a look at your gallery, last 48 walls. There are 6 of 48 rated 2 stars or lower, 5 of 48 rated 4 stars or higher, that means the rest are 2 1/2 to 3 1/2 stars.
I see nothing there that indicates anyone is rating your walls low. Remember since you are a journeyman the starting rating of three stars is just a placeholder. When the first person to rate it rates at say 2 1/2 stars, that becomes the rating. It is not averaged with the 3 star placeholder.
When another rates it then the ratings start being averaged.