Feels like there's a fine line between having a negative attitude about a new product and exposing real weaknesses - whether those are weaknesses in the product itself, or the market within which it falls. Probably nothing wrong with exposing weaknesses, as long as its done in the context of "here's what's wrong, and my idea of how it could be fixed or improved."

I agree with your assessment though, the Nest post this morning really was quite 'over the top' so to say, as far as negativity goes.