I think it is pretty interesting
Here is a post I did on it recently. The links contain quite a lot of information about how it works
www.labourlist.org/deliberative-democracy-diana-smith-power2010
If you are really interested in finding ways to engage, don't rule out your parties.
When I decided to join the Labour party a couple of years back, the first thing I wanted to do was to set up Open forums so that we could involve people who are not wanting to be in a party but do have ideas.
I did a number of these with my MP. They were good fun, and productive too. We always did full reports of the events and these got passed on to the relevant ministers, several of the ideas we put forward, including the suggestion for feed in tariffs, have now become law. - I'm not claiming the credit for that of course, but we will have contributed to the kind of "ground swell" that is always needed to make it possible to change the law.
There are also plenty of other avenues. If anyone is interested in Health and Social care, then there are bodies like "LINks" - which are intended as the way to allow people to scutinize and influence their local services.
If you are interested in climate change and the environment then Transition towns are really interesting. - and usually quite a lot of fun too.
Most people make the assumption that its hard to be heard, and hard to make anything change. Thats not the case. It just sometimes takes a little more time and a little more patience than you expect. Political parties do matter, and they all welcome young people!