As previously mentioned, they are a single issue party, and I personally am not a big fan of such groupings, nor do I get particularly exercised by the issues they find so important.
I agree with OEV a lot - The party system,closed constituency selection lists, slavishly adherence to the party whip, the Executive having control of the Motions agenda, and their ability to impose guillotines on debates, the Executive having control of the selection of chairpersons for all the select committees - these are all anti democratic measures which seriously compromise the effectiveness of the Commons.I quite like the idea of a commons independent MPs, where political parties are think tanks and lobbyists for their own manifesto - and the independent commons gets to pick which policies seem most compelling to the house.
Bring on the New Enlightenment! :)