Are you speaking from experience? I own 5 Nest devices (4 Protects and a thermostat) and haven't had a problem with any of them (outside of short connectivity outages with the thermostat - which continued working normally, otherwise.) I've owned the thermostat since Christmas of 2011 and the Protects much less time (4 months), but have yet to experience a problem (and hopefully won't when I need it most.)
I'm not in an extreme climate where I am, but we see temps ranging from slightly below freezing to over 100F. There's generally a lot of complaining online when Nest has an outage, but I can deal with not being able to adjust my thermostat remotely during those short periods of time. I've never had a false alarm on my Protects, but I recognize they had some issues early on.
That's not to say that people haven't had problems, but it's not an "endless shitstorm of problems" for everyone.