The truth is the vast majority of people get a great Mac on the first try. I think the problem occurs with the two or three percent (guess) that have some problem with new Mac. MacMall is known from most to being a terrible customer service company. For most people, I am sure they have a great buying experience.
I think that the reseller "system" is flawed. Once resellers have your money, they have no further interest in your sale. Think about it, only Apple and the buyer care about the purchase once transaction is complete. That is why I buy all of my Macs straight from Apple. The company has an interest in the sale until your warranty expires. Plus, Apple built it's company on great products and customer support.
I think the way to go is refurbished at Apple.com. They treat it as a new sale with full one year warranty.
Best wishes with your new Mac!