Why do I need to answer your question with specifics aside from just saying that I love the S pen capability? If you need specifics, i'll offer a few....I love the screenshot functionality, I love being able to then draw precise notes on top of a screenshot. I love using the function of clipping a small piece from a webpage and saving that to a prior note. I take notes in meetings, college classes, and my daughter loves to draw with it. There's so many reasons I love the S pen.
I know some people do not care for or need the S pen. And i'm not saying that's the ONLY good thing about it. what I am saying, is that Samsung has chosen to focus on the S pen when it comes to the Note series, and everything else is just small improvements upon the S series that gets released a few months prior. My entire point, is that the Note's biggest strength is that it has the S pen functionality. You seem offended that Samsung pushes the S pen so hard, yet it's their NOTE device line. Why wouldn't they push it when it's the entire point of the Note? Sure, there's many other great features like the metal trim, incredible screen, screen size, multitasking functionality, etc.. But there are other outstanding devices on the market that meet most of those categories and they do not push any s pen.
The phones I mentioned were just off the top of my head, so I apologize if those I mentioned did not meet your expectations. However the Note came out just barely before the Nexus 6 was announced, so people are still within their return window if they don't need or are offended by the S pen that they can return it and get the Nexus. That's why I mentioned that as an alternative even though it's not yet on shelves.
Back to my original point, each device has it's strengths and no one should or can expect the Note to compare in terms of external speaker to the HTC One or Moto X. The camera, that should meet expectations and outperform an iPhone 5s or whatever, so Samsung better release a software update to improve the performance because I too have had many of the problems OP mentioned.