We are looking into ways to reduce the scam attempts on the site, it's easier said than done due to the nature of Bitcoin, but we haven't given up yet on brainstorming new ideas.
We are also working on the feedback system and will be limiting the conditions where sellers and buyers can exchange feedback. In your case, once you've paid for an item you should be able to give the seller a feedback, but the seller should only be able to give you a feedback after they mark the item as shipped.
We are also working on an auto-suspend feature which will crawl the sellers' accounts and suspend those with xx% of bad feedback taking into account the age of the account and the number of sales they have.
As for the refunds we give the sellers the benefit of the doubt to respond to the refund request by shipping the item or contacting the buyer to resolve the issue. A lot of the sellers do as they know they would otherwise lose on a sale. Your refunds are being processed and should be send out shortly.
Thanks for replying so quickly and for sorting out the negative feedback the scammers left on my account.
Some suggestions I could think of are separating the feedback as a buyer and as a seller. Like this one guy (godofstarbucks or something) has 39 positives and 9 negatives, but most of the positives are as a buyer but his track record as a seller is horrible. Also it seems that some of the positive feedback are fabricated, ive seen account with 30+ positives but when you check half of came from one person with a suspended account...