Well, looks are important. It's a shame but they matter, it's an image we're selling. Ed Miliband has come out today claiming that he can never match an image like Cameron and thus admits it's going to be a point of weakness for Labour.
Maybe so, it's a deeply complex issue and the few years that a government is in power is not going to completely uproot and revert it. However, the way we got to the economy we have now can be traced back to the Thatcher regime, and if at best case scenario Labour didn't do anything that hurt the economy, historically they've had slower growth than a tory government.