Because Dundee Utd. and Hibs have only had a fraction of the budget Calderwood has had to work with. Hearts, despite having a larger wage bill, have had a revolving-door managerial policy. Which means that, on balance, Calderwood should have achieved more than 2 semi-finals and 1 3rd place finish. Getting to Europe once in 4 attempts is not good enough.
Sorry if you disagree Tradesman, but if your expectations are that low, maybe you should support a team befitting your level of ambition, like ICT or Motherwell?