It is not alone about performance (picture quality etc.) of a particular model, it is also about how the models of various manufacturers perform on the basis of reliability, service support (if needed), and how they perform w.r.t. specifications they advertise.
Keeping the general crowd in mind, people usually say x brand is good because they havent used Y brand at all. Keeping the general crowd in mind again- when people buy something new, their "reviews" are highly over exaggerated because they compare it with their previous product- usually which is outdated by a mile. Another reason why user's reviews is just another way to convert those over exaggerations into sales. Some things are best left to the real reviewers who wouldn't "sell out their soul" by writing ads in the form of a review. Such visible examples are how majority react when people hear about "AMD" as an advice. Its sad, despite assimilating adequate knowledge, people who usually flash their degree and job titles first are usually the idiots who don't choose based on unbiased reviews and benchmarks- rather how they their reflections will look when they see it and God knows what not. Not that I am marking down the OP- but people need to be wise when they make such polls. Remember, its because of idiots people run away from AMD, despite it producing good processors that are value for money.