It is hard to quantify the true percentage of phones with problems, as you only get anecdotal evidence from a forum such as this. I also read the horror stories about the GN. My son-in-law, who seems to have had every Android phone ever made, told me to go ahead and get it, but be prepared to use the return policy if needed. His take is that all phones have good/bad qualities, so the user experience is situational. He was right. Not to say that problems don't exist, but each person's experience will vary. In my experience, I live in a low signal area, but have had no issues at all. Best wishes on your decision, whatever you decide.
tap'd from my GNex