You assume that everyone is in this camp that "this show is freaking awesome except for these few minor details." In that case, focusing on the negatives would indeed be nitpicking. However, I am not some huge fan who just focusses on the little things for the sake of complaining. I think the show is legitimately terrible. Shitty dialogue, stiff acting, and nonsensical plot points are the rule, not the exception. Thus, talking about the bad things is not "nitpicking," it's discussing what I (we?) believe to be the general shittiness of the show overall. For people like me, focusing on any small positive points is the nitpicking.
And spare me the garbage about "nobody cares that you read the booooooks!" If I had been on this board in 1999, you better believe I would have talked about how terrible The Phantom Menace is and I would have done so in the context of how amazing A New Hope and Empire Strikes Back were. Also, the only reason any of the show-only people understand half of these plot points is because their book friends have outlined R + L = J on the internet for years. Ask any show-only person who Elia of Dorne is, why she's important, and who killed her, and I guarantee you'll be met with blank stares.