I'm sure Padrino has a niche in the Ruby community that it will appeal to, but I wish it brought more to the table than just being smaller than Rails and more full featured than Sinatra. If, say, it was engineered to be completely asynchronous, like node, that would be killer.

Its nice and I can see myself using it in very specific instances, but it doesn't feel like the Rails killer that the post title claims it is, but that's just me