The last time I tried it out I found that it had all of half a dozen websites and that was it. Nothing to see or do.
This has been my experience as well, which is a bummer because I think hidden services are the best part of Tor, and my understanding is that I2P is basically designed with hidden service like features in mind from the ground up.
It seems like something like this would be great for people living under authoritarian regimes--feels like making I2P dead-simple would benefit a lot of people and help to make censorship more difficult.
I too would love a one button solution. And also a server-only node.