It's not just to find complaints, but I'm sure it's also to counter them too. For example someone to come across as an expert and say.... it's not a problem with the rotors or braking system design it's because you didn't tighten lug nuts in the right sequence and torque specs or you probably didn't bed in properly or your not using OEM equipment. Or it could be to market new or alternative products... such as "i know it really stinks GM did away with the Pontiac and the G6 line, but have you tried the Malibu. It's honestly just as sexy. I test drove one the other day and swear that two really hot babes... and I mean like model babes blew me kisses... and a hunky guy and I'm pretty sure he was a model too." Lol, doesn't really have to be all blatent, could just be "i test drove the malibu and it's got a smooth ride and good power".
As for complaints... yea what's up with the wipe blades? I use rain X so don't need the fancy blades, so 10-15 should be the cost for two... not $35-40 for special ones