All around us you see examples of things being loved or hated, with little in between. You begin to see this pattern in everything from politics to books. The problem with this is the blanket hate, especially in something like politics. People are allowed to pick and choose, and choosing "I like this, not that," helps someone like the author improve their writing as a whole, and us focus on what we really want in someone like a politician. Everyone benefits from a more specific analysis of why we like or dislike something.
Opposite the blanket hate, we get the fanboyism. Being a fanboy today means that you like something for no real reason. A common thing to be a fanboy (or fangirl) about is books or movies. Who cares if the most recent Twilight movie sucked? You feel obligated to love it because you have established yourself as a fan of the series. Fanboyism is bad. Take this for example; you are buying a new computer. You go to a tech forum and ask, "is AMD or Intel better for my budget?". You will get some well thought out answers, with specs and prices, but the rest will just be the personal preference of that person, regardless of your needs. Now, you might see an overwhelming response to get Intel. This might make you think, "these people really hate AMD, they must be a bad company." Congratulations, you have been converted into a fanboy. Now when you need to make that choice again, you will most likely choose Intel again, without a real reason why.
Personally, I am a huge fan of Google, but I don't like everything they do. I don't feel the need to love Google Books because I like Google+. That is the difference between fanboyism and an honest opinion. By eliminating the blanket love for something, I ensure that I use only what I want to use, and don't waste my time on what I don't want.