Where to start... where to start? He is the reason I think the show has flaws. Yes, he is supposed to be a genius. Yes, he is insufferable. My family has a Sheldon... a cousin who did army biological research and now is writing papers for NASA and all sorts of metabolism studies involving suspending rats by their tails, etc. Anyway, Sheldon's squeaky voice is worse than chalk on a blackboard. It is obviously put on... I have never heard Jim Parsons off camera, but I cannot believe such an annoying voice really exists. I do know he is in real life a gay person. However, I feel perhaps the LGBT community finds him insulting and flamingly over the top. Nathan Lane on Modern World and in Bird Cage did a wonderful job of being both funny and a flaming gay... even by gay standards. Nathan Lane acts in a credible manner in his roles. Jim Parsons does not. His character just breaks through the credibility meter and crashes into a poor cartoon version of what might have been a solid acting and performing character that held up as well as the rest of the cast, which by the way, did a wonderful job week after week, year after year.
So... there is the reason why I hate Sheldon Cooper or perhaps the derivative version acted by Jim Parsons. He is the fly in the ointment that spoils a terrific job of adequate writing and commitment by the rest of the cast. Kaley Cuoco is the main reason I started and continued watching. It was not to watch obvious Jewish and Indian jokes, toilet jokes, and low hanging fruit puns and innuendos. The weekly sizzle that kept the series going was the pursuit dream of an average nerd with high intelligence pursuing the hot girl. And 90 million nerds tuning in weekly to see if he gets the hot girl, all the while taking notes to see how he does it. The payoff is Leonard actually marrying Penny, and the payoff continued as people watched weekly, in a voyeur sense of experiencing life as they never would.
The Bernadette / Howard plots were distracting and close to annoying. We sympathized with Rajesh as we hoped he could navigate the dating rituals of the USA. Leonard was us, as we watched him pursue the hot girl. Sheldon was a plot point in his character, and I am sure the writing could have been solid for Sheldon, had a suitable actor been found who could breathe real life into the character, instead of making fun of the character. That is, although Jim was indeed a gay man, what he brought to the screen is definitely not what a real gay person is like. Nathan Lane as I alluded to earlier... as a younger person... would have been a perfect Sheldon Cooper. I actually wonder if the Nathan Lane at the series start might not have been much funnier than Jim Parsons.
That was the problem for me. I could not suspend my disbelief and accept Sheldon Cooper as real. All I saw in his annoying portrayal week to week was a screeching narcissistic cartoon who in real life would have been flung to the curb by any real band of genuinely intelligent people. Leonard, Howard, and Rajesh struck me as real. Penny acted real, and was written as real. So did Amy and even a screechy Bernadette, who nevertheless was suitably credible. I found myself constantly wanting Sheldon to just STHU throughout the episodes, but saw so much good in the other characters and writing that it kept me coming back. I don't know how to express my constant disappointment in not seeing what the series could have been with an adequate lead actor. Any adequate lead actor... straight or gay.