Aadvark was really useful and what made it really good was that it tapped into your existing network. I remember being able to ask questions right from Google Talk.
I think why people are a bit confused about Jelly is because of the over emphasis on pictures. If they focus it on "harnessing your network's intelligence" it would be much easier to grasp.
They should also go beyond iPhone and Android. The desktop web is still being used (I am typing this on my laptop). It will also help people to search public questions and answers.
Right now, I use my BBM status message, Twitter, and Facebook to crowd source answers to questions such as "Please, where can I get a Sharwama at this time in the Island (where I stay)?"
I usually get a response. But to 95% of my network, the question is just noise.
It would be much better if that question could go directly to my friends who have lived in the area I speak for. And perhaps they could forward to to their friends who can answer that question.
I believe over time, they will fine tune it and de-emphasize the photo aspect. I look forward to the evolution.