Yeah the usability sucks. Right now the problem is that one can use it after 15 minutes of training and become expert in may be few hours of training, after which you can create super complex sites like twitter/HN.

I am doing a UX rewamp and trying to minimize the learning curve. The next version with some major UI modifications and support for all browsers should be out in 2 weeks. Do follow me on twitter or drop a line and I will make sure you know.