Brett, I'm certain that as cynical, harsh and snarky some comments here might appear, most do mean well. It's a twisted form of constructive criticism to say the least, especially on HN. Some look at the details, others the overall implementation, a few will complain and some aren't even sure of what they're seeing. But I think the most important takeaway from this thread is that you have a pretty good collection of items to explore. I think a founder engaging a community of critical early-adopters is one of the best ways to polish the initial edges and perfect your product for wide adoption. There's always something to add to the feature-set.

Note: It's difficult to see from your site that you also have a desktop version (support). This might be as important as the mobile version for those of us who don't create on our iPads and would rather review on tablet.