You may not like Howard, but he fought to be our PM (which you have to respect). Battled to be Opposition Leader, fought failed elections, came back from the dead, and fought Costello to hold onto power for 11 years.
Like him or hate him, he thought he was Australia's best leader for this time, and he fought for it. THIS is what I expect from a leader.
Costello needs to show this same commitment, and go through the hard yards. If he can rebuild the Libs, and swing the result next election (esp if ALP stuff it up with the unions), the revival combined with his economic record will make him a Liberal hero that will be above Howard in history.
This is a major opportunity lost by Costello, and personally disappointing for me (I was looking forward to seeing him as an aggressive opponent to the ALP, I definitely think he could have done well).