Certain people don't like Sony for a number of reasons. I, for instance, don't like their business practices and the fact that many of their products are of inferior quality. They charge for their name, just like Bose and Monster Cable.
My opinion has been reinforced lately since I started working at a local home theater shop, which is also a Sony service center (along with many other brands). Sony has, by far, the highest rate of repair out of all of the brands (Including Yamaha, Denon, Mitsubishi, Toshiba, Samsung, Panasonic, and Sanyo).
As you can probably tell, I have a rather obvious bias against Sony. However, you shouldn't let my opinion prevent you from enjoying your system.