Whatever system we use we will continue to get one of the two (Labour/Conservative) being the largest party. We will also be unable to get a government that represents the wishes of the people (at least according to some polls). Both parties seem to be in favour of continuing as part of the EU. And when voted into power claim to have a 'mandate' for their policies, even if their opposition had exactly the same intentions in their manifesto.
Alongside the general election we should also get a couple of referendum questions on matters that are important to the public (EU membership / Capital punishment) then whoever gets into power will have a mandate on the subject (although maybe not the mandate they want!)
I'm sure that if the public thought they could influence policy in this way (apart from just voting for a party) then the voter turnout would also improve.