Being able to hide sellers is a must. It allows you to 1) stop seeing the hacks you rated positively out of courtesy (who appear on the main page with the byline “based on your orders”); 2) stop seeing the hacks you would never work with; 3) stop seeing the sellers who have too much negative press; 4) stop seeing sellers who just don’t get it.
This won’t solve all those issues, but if you clear out your cookies & cache, you might not see as many of those bad-boy-gigs you don’t want to look at after viewing them before.
+1 for the ignore/block list. Would cut down on the noise when searching for things.