Toolhaus is a site that allows you to see a seller's (or buyer's) negative and neutral feedback without having to search through their positives. They have other tools on their site as well
Toolhaus
You can click on the number in the 'Recent Feedback Ratings' box on ebay.co.uk and it will show just the negs/nuets. Doesn't work on .com and only if they're within the last 12 months on .co.uk, of course.