I wish the level was right, but honestly, for me, no iPhone I've ever had has gotten the compass right... it's always been 5-15 deg off. Every one.
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The iPhone 5S is my second iPhone. It rattles badly (Homebutton and Camera), failes to recognize my fingerprint four times out of five and as if this wasn't enough, I just found out I'm affected by bad sensor calibration as well.
1. If your Home button rattles, take it in and get a replacement. That shouldn't happen.
2. The "camera rattle" isn't your camera. It's the vibration motor, and it's supposed to do that. There's tons of posts about that one online.
3. If it doesn't recognize your fingerprint 4 of 5 times, it's probably related to the rattle you mentioned in the home button. See #1 and get it replaced. The fingerprint sensor, from my experience and what I've read from others, seems remarkably reliable, so if your's isn't, like I said, see #1.