Did they remove filtering buyers with negative or 0 feedback? That feature was pretty useful...

[tze1000-6]

How would I go on and filter buyers who have 0/negative feedback then?

[silverpinups]

Buyers don't have Negative Feedback. Sellers can only leave Positive Feedback for Buyers (since 2008) but Buyers can leave Negative Feedback for Sellers.

Click on Help & Contact: Managing bidders and buyers