This is an amazingly light convenience, with really solid, streamlined execution. People, it's ok to think something is good.
I was going to post a comment about it, mainly as a data point, in case such things matter to the site owner. OTOH I have on iPhone and I don't have a Mac I use often enough to care about this sort of product anyway; it's in perpetual sleep mode 99% of the time. I'm not the target audience.
Does mentioning my dislike for the site make me negative? Is it to the long-term good that people feel reluctant to offer criticism?
I do get the point about "Knock stuff to show your IQ"; it's unpleasant and an easy habit to fall into. I've been with groups of geeks where it's impossible to discuss almost any piece of software because it turns into a dick measuring contest. (So to speak.)
Still, sometimes some things really are flawed and those flaws are worth pointing out.
I suppose that every criticism should be accompanied by some suggestion on how to fix or improve things, but that's not always possible.
I don't have any really good suggestions on how to temper negativity other than to encourage people to pause and consider why they are posting something, and for others to try to ignore the posts that irk them.
All the same, though, it is expected that almost all new startups will fail and most products will not be "the best" or even original. That's the nature of competition; only the top products get any traction at all. Given that, I would expect critiques of most new ventures.
Just people you disagree with someone doesn't make them negative.
It's critique. HN is a place of dissenting opinions.
It's ok to have an opinion different than yours.
Edited for clarity.