idone & jevolution: While I see your points, it appears you haven't owned a business... I can think of MANY scenarios in which this plays out. Any store that has an 'inhouse' brand is essentially doing a similar practice. If they weren't making money on their product, they would just continue to sell the name brand.
That goes for Best Buy, Walmart, Target, Cub Foods, just to name a few. To think that a salesman makes money on telling the whole truth, all the time, is naive. If word of mouth was so powerful, the person in question would likely not even be in Game Stop to buy a controller in the first place. Salespeople are there to 'help' a customer, not give the ins and outs of every different option.
Wise up and do a little research before you buy and then salespeople become nothing but an annoyance. Yes, the argument that not everyone has internet access or the smarts to do their own research is valid, but everyone I know has friends. As a matter of fact, that is exactly what saved this potential customer.
What if the salesman didn't really know the controller was less reliable? Are we supposed to blame the salesman for being ignorant? If so, my previous argument about not everyone having the ability to research every purchase comes back around...
Bottom line, if someone doesn't know what they are buying, it is on their shoulders, not someone selling the product.