I have yet to use a smartphone where at some point I didn't touch the volume buttons. I think the iPhone was the worst as the buttons were soft. I've just learned to check it every now an then.
Also how is there no button to end the call fast? Maybe I'm nuts, but I just tested the phone app and the end button is plain as day in red no less. I pressed it and the call was ended immediately. And now does the phone just dial? Even when I select a contact, I have to select one more time to call. It's a two step process. Do you have some kind of speed dial setup? Maybe I'm just misunderstanding you.
IMO, the rest of your complaints are subjective (except for the keyboard wobble). I love the notification system on this phone as well as the email layout and readability.
My phone is solid, and no kb wobbling whatsoever. Also sliding out the keyboard takes some effort. Maybe it will loosen up over time, I don't know. If yours is as you described then that alone says you got defective phone, nevermind the other issues.